* Add tests for `get_fqdn_and_port` method.
Currently tests verify original behavior - returning default `ssh-keyscan` port
Add test around `add_host_key` to verify underlying command arguments
Add some new expectations for `get_fqdn_and_port`
Test that non-standard port is passed to `ssh-keyscan` command
* Ensure ssh hostkey checks respect server port
ssh-keyscan will default to getting the host key for port 22.
If the ssh service is running on a different port, ssh-keyscan
will need to know this.
Tidy up minor flake8 issues
* Update known_hosts tests for port being None
Ensure that git urls don't try and set port when a path
is specified
Update known_hosts tests to meet flake8
* Fix stdin swap context for test_known_hosts
Move test_known_hosts from under basic, as it is its own library.
Remove module_utils.known_hosts from pep8 legacy files list
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