COLLECTD_OPENSTACK_GIT_BRANCH has been updated to stable/pike so that aodh
changes will be picked up
Previously, the branch was not actually being checked out, but was being
used as a name for a new branch. This behaviour has been corrected.
Change-Id: I516c4311d2a0cedcca6ec293b62c21234b1e1975
Signed-off-by: Emma Foley <emma.l.foley@intel.com>