By default, if the same role is called in ansible it will only run
once per node. Due to how we have the inventory setup ansible views
every service as a different node and will try to run the common role
tasks again. This causes slowdown in all cases but is particularly
noticable when pulling images. A small change will ensure these tasks
only run once per node per run as originally intended.
TrivialFix
Change-Id: I20b9c46991d10176c8f8645a335eb7a9ed750ee3