Removes manual service resource commands

This fixed Fedora 20 tests per https://github.com/brianbianco/redisio/pull/142 and https://github.com/brianbianco/redisio/issues/117. Apparently, the problem was that even though chef knows how to handle services in systemd (it has a separate provider), we were overriding the commands to start/stop/status/restart, and Fedora 20's `service` wrapper doesn't correctly wrap systemd's commands. But, if you remove our overrides, Chef knows how to run the correct systemd commands directly, so then systemd knows when redis is started correctly, and the status commands begin to work correctly too.

I think this fixes all tests and gets rid of any remaining stderr/stdout weirdness.