fix zip_file shadowing per #18933
Merge pull request #18959 from thatch45/zipfile_shadow

fix zip_file shadowing per #18933
Skip tests which require the SSHD server running in case it's not
Merge pull request #18970 from s0undt3ch/hotfix/skip-if-no-sshd-server-running

Skip tests which require the SSHD server running in case it's not
The return value of `__virtual__` should never be `None`
Merge pull request #18975 from s0undt3ch/hotfix/sysrc-virtual-fix

The return value of `__virtual__` should never be `None`