trigger devstack-gate test as early as possible

if we have changes to devstack-gate we need need to run this as
early as possible. So do this the second we've decided that
we need to run devstack gate in our project list.

Change-Id: I60464965a2e4cea5e1c85ea8833e98a8471fa5f1
Merge "trigger devstack-gate test as early as possible"