Change:
- Move hostnamectl check out of GenericStrategy because it was incorrect
for everything except the SystemdStrategy which is where it belongs.
- Add some initial tests for the hostname module, though we are limited
by the fact that we can't do much testing with it in containers.
Test Plan:
- new hostname integration tests
Signed-off-by: Rick Elrod <rick@elrod.me>
Co-authored-by: Sam Doran <sdoran@redhat.com>
