Execute common roles once on all nodes

Execute common roles once on all nodes

The common roles don't need to be executed again on each group plays
(like mons, osds, etc..).
We only need to execute them during the first play. That wat, we will
apply the changes on all nodes in parallel instead of doing it once per
group.

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>