Speed-up mgrutil.remove_ssh_known_host runner function

[agraul]

What does this PR change?

mgrutil.remove_ssh_known_host uses Salt's ssh.rm_known_host function. ssh.rm_known_host computes the path to the known_hosts file if that is not passed. This computation can take a long time because it uses the generic user.info function, which can be slow when users configure e.g. winbindd to provide user/group information.

We now bypass this potentially expensive computation and try to find the config file ourselves.

GUI diff

No difference.

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

• No tests: we don't have environments where we can test the runtime performance of "slow" directory servers.

• DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/24171
Port(s): https://github.com/SUSE/spacewalk/pull/24315

• DONE

Changelogs

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