In order to optimise the role execution and
to improve consistency, the following is done:
1. The services dict is filtered per host to
prevent skipped tasks from spamming the
logs and wasting execution time.
2. The service restart is implemented in a
specific order to improve consistency. The
order implemented is a wild guess as there
is no upstream documentation about the
'correct' order.
3. The service enable/start is consolidated
into the handler to be more efficient.
4. A dynamic include is used instead of nesting
includes for the init prep.
Change-Id: I91d20b980f1b1a63ff2d6ef30bcec7ef58a5571a
f7de00cadd