Ensure ssh hostkey checks respect server port (#20840)2.2-test

* 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

(cherry picked from commit 103ede26dfe012cc2aef268ff97b73fd9b906c23)

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