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##### SUMMARY
When i collect facts from TrueNAS, with the command : `ansible truenas -m setup | grep "ansible_distribution"`
the variable "ansible_distribution_major_version" is missing.
When i use same command on debian host, the variable is stell here

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
lib/ansible/module_utils/facts

##### ANSIBLE VERSION
```
ansible 2.10.2
  config file = /srv/ansible/ansible.cfg
  configured module search path = ['/srv/ansible/library']
  ansible python module location = /srv/ansible-venv/lib/python3.7/site-packages/ansible
  executable location = /srv/ansible-venv/bin/ansible
  python version = 3.7.3 (default, Dec 20 2019, 18:57:59) [GCC 8.3.0]
```

##### CONFIGURATION
<!--- Paste verbatim output from "" between quotes -->
```
ANSIBLE_FORCE_COLOR(/srv/ansible/ansible.cfg) = True
DEFAULT_HOST_LIST(/srv/ansible/ansible.cfg) = ['/srv/ansible/site.host']
DEFAULT_JINJA2_EXTENSIONS(/srv/ansible/ansible.cfg) = jinja2.ext.do
DEFAULT_MANAGED_STR(/srv/ansible/ansible.cfg) = Gestion par Ansible: {file} modifie le %Y-%m-%d %H:%M:%S par {uid} depuis {host}
DEFAULT_MODULE_PATH(/srv/ansible/ansible.cfg) = ['/srv/ansible/library']
DEFAULT_ROLES_PATH(/srv/ansible/ansible.cfg) = ['/srv/ansible/roles']
DEFAULT_STDOUT_CALLBACK(/srv/ansible/ansible.cfg) = yaml
DISPLAY_SKIPPED_HOSTS(/srv/ansible/ansible.cfg) = False
INTERPRETER_PYTHON(/srv/ansible/ansible.cfg) = auto_silent
RETRY_FILES_ENABLED(/srv/ansible/ansible.cfg) = False

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->


##### STEPS TO REPRODUCE
ansible truenas -m setup | grep "ansible_distribution"

##### EXPECTED RESULTS
```
...
        "ansible_distribution": "FreeBSD",
        "ansible_distribution_release": "12.2-RC3",
        "ansible_distribution_major_version": "12",
        "ansible_distribution_version": "FreeBSD 12.2-RC3 7c4ec6ff02c(HEAD) TRUENAS",
...
```


##### ACTUAL RESULTS
```
...
        "ansible_distribution": "FreeBSD",
        "ansible_distribution_release": "12.2-RC3",
        "ansible_distribution_version": "FreeBSD 12.2-RC3 7c4ec6ff02c(HEAD) TRUENAS",
...
```

debian_facts = {}
        if 'Debian' in data or 'Raspbian' in data:
            debian_facts['distribution'] = 'Debian'
            release = re.search(r"PRETTY_NAME=[^(]+ \(?([^)]+?)\)", data)
            if release:
                debian_facts['distribution_release'] = release.groups()[0]
            
            if collected_facts['distribution_release'] == 'NA' and 'Debian' in data:
                dpkg_cmd = self.module.get_bin_path('dpkg')
                if dpkg_cmd:
                    cmd = "%s --status tzdata|grep Provides|cut -f2 -d'-'" % dpkg_cmd
                    rc, out, err = self.module.run_command(cmd)
                    if rc == 0:
                        debian_facts['distribution_release'] = out.strip()
        elif 'Ubuntu' in data:
            debian_facts['distribution'] = 'Ubuntu'
            
        elif 'SteamOS' in data:
            debian_facts['distribution'] = 'SteamOS'
            
        elif path in ('/etc/lsb-release', '/etc/os-release') and ('Kali' in data or 'Parrot' in data):
            if 'Kali' in data:
                
                debian_facts['distribution'] = 'Kali'
            elif 'Parrot' in data:
                debian_facts['distribution'] = 'Parrot'
            release = re.search('DISTRIB_RELEASE=(.*)', data)
            if release: