Expose uses_systemd as a distro function

Without this change the tests are currently failing on rhel7
since a location where a hostname file is written no longer
exists at that location when systemd is active. To avoid this
allow the test to inspect if the distro has systemd enabled
and avoid testing the file when systemd is being used so the
test passes.

We likely need to figure out a better way to test features 
that no longer exist as files but exist as commands with
systemd in general.

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