##### SUMMARY
<!--- Explain the problem briefly below -->
The settings in `ANSIBLE_SSH_ARGS` are not applied to any host created with `add_host` resulting in incorrect connection to those hosts.
##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
`lib/ansible/plugins/connection/ssh.py`
##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.11.0.dev0
  config file = /Users/sdoran/.ansible.cfg
  configured module search path = ['/usr/local/share/ansible/library']
  ansible python module location = /Users/sdoran/Source/ansible/lib/ansible
  ansible collection location = /Users/sdoran/.ansible/collections:/usr/local/share/ansible/collections
  executable location = /Users/sdoran/Source/ansible/bin/ansible
  python version = 3.8.2 (default, May 12 2020, 12:11:39) [Clang 11.0.3 (clang-1103.0.32.59)]

```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
DEFAULT_LOG_PATH(env: ANSIBLE_LOG_PATH) = /Users/sdoran/.ansible/ansible.log
DEFAULT_VAULT_PASSWORD_FILE(env: ANSIBLE_VAULT_PASSWORD_FILE) = /Users/sdoran/bin/getvaultkey.sh
DEVEL_WARNING(env: ANSIBLE_DEVEL_WARNING) = False
```

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


##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
Run the following playbook passing `ANSIBLE_SSH_ARGS` as an environment variable

```
env ANSIBLE_SSH_ARGS='-o UserKnownHostsFile=/dev/null' ansible-playbook playbook.yml -vvv
```
<!--- Paste example playbooks or commands between quotes below -->
```yaml
- hosts: localhost
  gather_facts: no
  tasks:
    - add_host:
        name: delegatetome
        ansible_host: 127.0.0.1

- name: Play against added host
  hosts: delegatetome
  tasks:
    - ping:
```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
`ANSIBLE_SSH_ARGS` are applied to the host created with `add_host` and used during connection.
<!--- Describe what you expected to happen when running the steps above -->
(output truncated)
```
...
PLAY [Play against added host] ****************************************************************************************

TASK [Gathering Facts] ************************************************************************************************
<127.0.0.1> SSH: EXEC ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o...
...
```

##### ACTUAL RESULTS
Missing `ANSIBLE_SSH_ARGS`.
```paste below
...
PLAY [Play against added host] ****************************************************************************************
META: ran handlers

TASK [ping] ***********************************************************************************************************
task path: /Users/sdoran/Projects/Vagrant/Ansible Lab/test-local.yml:16
<127.0.0.1> ESTABLISH SSH CONNECTION FOR USER: None
<127.0.0.1> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s...
...
```

- name: ANSIBLE_SSH_CONTROL_PATH
        ini:
          - key: control_path
            section: ssh_connection
        vars:
          - name: ansible_control_path
            version_added: '2.7'
      control_path_dir:
        default: ~/.ansible/cp
        description:
          - This sets the directory to use for ssh control path if the control path setting is null.
          - Also, provides the `%(directory)s` variable for the control path setting.
        env:
          - name: ANSIBLE_SSH_CONTROL_PATH_DIR
        ini:
          - section: ssh_connection
            key: control_path_dir
        vars:
          - name: ansible_control_path_dir
            version_added: '2.7'
      sftp_batch_mode:
        default: 'yes'
        description: 'TODO: write it'
        env: [{name: ANSIBLE_SFTP_BATCH_MODE}]
        ini:
        - {key: sftp_batch_mode, section: ssh_connection}
        type: bool
        vars:
          - name: ansible_sftp_batch_mode
            version_added: '2.7'