Currently when multiple services share a host, the
restart order is random. This is due to an unordered
dict being used to facilitate the mapping of services
to their groups, names and other options.
This patch implements changes to the role to ensure
that services on the same host are restarted in the
correct order when the software/config changes.
Change-Id: I52fc66f861ce98cc8299c84edcfd5f18d74306b3
545e362b05