fix CI test (missing services)

[symbx]

Issues causing tests to fail:

• Missing services in test image (test_is_active) - ubuntu uses "ssh" name instead "sshd" and does not have "ntpd", "dropbear" by default
• Failed to check services without specifying type (test_service_unit_construction) with some services (observed with proc-sys-fs-binfmt_misc
• Specific service type for swap
• Clippy complains about using Error::new(ErrorKind::Other... instead of Error::other(...

These are only tests I saw failing. I hope this helps to unblock other PRs

[symbx]

Changes may break local tests if local system does not have rsync, nginx services or have ssh as sshd.
May be there way to made test in better way (beside listing units, as it may skip test entirely)

[joe-saronic]

Thank you for this!