This commit will swap the special service provider variable from undef
to redhat for EL7 platforms.
This needs to be done to work around an issue[1] where the systemd
service provider on Puppet 4 doesn't understand services started as a
dependencies, also know as "static" as enabled. This results in the
service "dbus" being enabled on every run. Using the deprecated
legacy "service" command solves th issue.
[1] https://tickets.puppetlabs.com/browse/PUP-5353
Change-Id: I54b1bb85869f2749079288df9fae76db00f43038