### Summary

Ansible may report the wrong `ansible_os_family` fact on Flatcar Container Linux. The correct value is `Flatcar`, however some users are seeing `Flatcar Container Linux by Kinvolk` for the same fact under certain circumstances, which leads to wrong playbook behavior given that Ansible fails to identify Flatcar as the running distro.

In https://github.com/ansible/ansible/pull/69627 we've contributed Ansible core logic which affects the value of `ansible_os_family` for Flatcar. Back then we've specified `/etc/flatcar/update.conf` as the file based on which to figure out the name of the distro (likely because that's how CoreOS - Flatcar's direct ancestor - used to do the same). **This decision no longer makes sense to us** given that this file isn't the authoritative place for the distro name. Moreover, `/etc/flatcar/update.conf` may sometimes be missing based on user-provided bootstrap configuration.

### Issue Type

Bug Report

### Component Name

Ansible core

### Ansible Version

```console
$ ansible --version
ansible [core 2.11.5]
  config file = None
  configured module search path = ['/home/me/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/me/.local/lib/python3.8/site-packages/ansible
  ansible collection location = /home/me/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/me/.local/bin/ansible
  python version = 3.8.10 (default, Nov 26 2021, 20:14:08) [GCC 9.3.0]
  jinja version = 3.1.1
  libyaml = True
```


### Configuration

```console
$ ansible-config dump --only-changed
```


### OS / Environment

Flatcar Container Linux 3139.2.0 for example

### Steps to Reproduce

Follow the official [instructions](https://www.flatcar.org/docs/latest/installing/vms/qemu/) to run Flatcar locally on QEMU:

```
mkdir flatcar; cd flatcar
wget https://stable.release.flatcar-linux.net/amd64-usr/3139.2.0/flatcar_production_qemu.sh
wget https://stable.release.flatcar-linux.net/amd64-usr/3139.2.0/flatcar_production_qemu.sh.sig
wget https://stable.release.flatcar-linux.net/amd64-usr/3139.2.0/flatcar_production_qemu_image.img.bz2
wget https://stable.release.flatcar-linux.net/amd64-usr/3139.2.0/flatcar_production_qemu_image.img.bz2.sig
bzip2 -d flatcar_production_qemu_image.img.bz2
chmod +x flatcar_production_qemu.sh

ssh-keygen -f key -q -N ""

./flatcar_production_qemu.sh -a ./key.pub -- -nographic
```

On another shell, SSH into the Flatcar VM:

```
cd flatcar
ssh -p 2222 -i key core@localhost
```

Install PyPy (Flatcar doesn't ship with a Python interpreter):

```
cd /opt
wget -O - https://downloads.python.org/pypy/pypy3.8-v7.3.9-linux64.tar.bz2 | sudo tar xjf -
sudo ln -s /opt/pypy3.8-v7.3.9-linux64/bin/pypy /opt/bin/python
```

Run Ansible against the VM and print the OS family:

```
cat <<EOF >playbook.yaml
- hosts: all
  user: core
  tasks:
  - name: Print distro
    debug:
      var: ansible_os_family
EOF

ansible-playbook playbook.yaml -i localhost:2222, --key-file ./key -e ansible_python_interpreter=/opt/bin/python -e ansible_port=2222
```

Output:

```
PLAY [all] *****************************************************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] *****************************************************************************************************************************************************************************************************************************************ok: [localhost]

TASK [Print distro] ********************************************************************************************************************************************************************************************************************************************ok: [localhost] => {
    "ansible_os_family": "Flatcar Container Linux by Kinvolk"
}

PLAY RECAP *****************************************************************************************************************************************************************************************************************************************************localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
```

SSH into the VM and populate `/etc/flatcar/update.conf` with dummy values:

```
printf "SERVER=foo\nGROUP=bar\n" | sudo tee /etc/flatcar/update.conf
```

Run the play book again:

```
ansible-playbook playbook.yaml -i localhost:2222, --key-file ./key -e ansible_python_interpreter=/opt/bin/python -e ansible_port=2222
```

Output:

```
PLAY [all] *****************************************************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] *****************************************************************************************************************************************************************************************************************************************ok: [localhost]

TASK [Print distro] ********************************************************************************************************************************************************************************************************************************************ok: [localhost] => {
    "ansible_os_family": "Flatcar"
}

PLAY RECAP *****************************************************************************************************************************************************************************************************************************************************localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
```

### Expected Results

I expected to always see `Flatcar` as `ansible_os_family` on Flatcar Container Linux.

### Actual Results

```console
The value of `ansible_os_family` changes based on the existence of `/etc/flatcar/update.conf`.
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
alpine_facts = {}
        alpine_facts['distribution'] = 'Alpine'
        alpine_facts['distribution_version'] = data
        return True, alpine_facts
    def parse_distribution_file_SUSE(self, name, data, path, collected_facts):
        suse_facts = {}
        if 'suse' not in data.lower():
            return False, suse_facts  
        if path == '/etc/os-release':
            for line in data.splitlines():
                distribution = re.search("^NAME=(.*)", line)
                if distribution:
                    suse_facts['distribution'] = distribution.group(1).strip('"')
                
                distribution_version = re.search(r'^VERSION_ID="?([0-9]+\.?[0-9]*)"?', line)
                if distribution_version:
                    suse_facts['distribution_version'] = distribution_version.group(1)
                    suse_facts['distribution_major_version'] = distribution_version.group(1).split('.')[0]
                if 'open' in data.lower():
                    release = re.search(r'^VERSION_ID="?[0-9]+\.?([0-9]*)"?', line)
                    if release:
                        suse_facts['distribution_release'] = release.groups()[0]
                elif 'enterprise' in data.lower() and 'VERSION_ID' in line:
                    
                    release = re.search(r'^VERSION_ID="?[0-9]+\.?([0-9]*)"?', line)
                    if release.group(1):