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##### SUMMARY
If you don't have an ssh client installed in container image or on your system, ansible just throws following error -  `The error was: FileNotFoundError: [Errno 2] No such file or directory: b'ssh': b'ssh'` error. 

```
TASK [Gathering Facts] *********************************************************
[WARNING]: Unhandled error in Python interpreter discovery for host <hostname1>: [Errno 2] No such file or directory: b'ssh': b'ssh'

[WARNING]: Unhandled error in Python interpreter discovery for host <hostname2>: [Errno 2] No such file or directory: b'ssh': b'ssh'

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: FileNotFoundError: [Errno 2] No such file or directory: b'ssh': b'ssh'
fatal: [<hostname1>]: FAILED! => {"msg": "Unexpected failure during module execution.", "stdout": ""}

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: FileNotFoundError: [Errno 2] No such file or directory: b'ssh': b'ssh'
fatal: [<hostname2>]: FAILED! => {"msg": "Unexpected failure during module execution.", "stdout": ""}
```

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
2.9.6
```

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
Run playbook on the system where ssh client is not installed & playbook is expecting to use ssh keys for remote hosts.


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##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
If possible adding an error message indicating `ssh client is not installed on the system`

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->

<!--- Paste verbatim command output between quotes -->
```paste below
Error message mentioned in the summary 
The error was: FileNotFoundError: [Errno 2] No such file or directory: b'ssh': b'ssh'
```

Thank you!!
scp_executable:
          default: scp
          description:
            - This defines the location of the scp binary. It defaults to `scp` which will use the first binary available in $PATH.
          env: [{name: ANSIBLE_SCP_EXECUTABLE}]
          ini:
          - {key: scp_executable, section: ssh_connection}
          version_added: "2.6"
          vars:
              - name: ansible_scp_executable
                version_added: '2.7'
      scp_extra_args:
          description: Extra exclusive to the ``scp`` CLI
          vars:
              - name: ansible_scp_extra_args
          env:
            - name: ANSIBLE_SCP_EXTRA_ARGS
              version_added: '2.7'
          ini:
            - key: scp_extra_args
              section: ssh_connection
              version_added: '2.7'
      sftp_extra_args:
          description: Extra exclusive to the ``sftp`` CLI
          vars:
              - name: ansible_sftp_extra_args
          env:
            - name: ANSIBLE_SFTP_EXTRA_ARGS
              version_added: '2.7'
          ini: