liberty super fix

this patch munges three items into one to fix liberty:
- set gitreview branch
- oslo.messaging fix: Iec2f394818441cec88e7b201c12e3684442672c8
- devstack fix: I830018cb3008f1036880c29c9a851b109a9be65e

Change-Id: Iec19a5406e406f6946fc8ba71d9d5e8d41575e29

.gitreview

@@ -2,3 +2,4 @@
 host=review.openstack.org
 port=29418
 project=openstack/aodh.git
+defaultbranch=stable/liberty

aodh/tests/base.py

@@ -42,7 +42,7 @@ class BaseTestCase(base.BaseTestCase):
         # NOTE(sileht): oslo.messaging fake driver uses time.sleep
         # for task switch, so we need to monkey_patch it
         # and also ensure the correct exchange have been set
-        eventlet.monkey_patch(time=True)
+        eventlet.monkey_patch(time=True, thread=True)
 
         # NOTE(sileht): Ensure a new oslo.messaging driver is loaded
         # between each tests

devstack/plugin.sh

@@ -131,7 +131,12 @@ function _aodh_create_accounts {
 
 # Activities to do before aodh has been installed.
 function preinstall_aodh {
-    echo_summary "Preinstall not in virtualenv context. Skipping."
+    # Needed to build psycopg2
+    if is_ubuntu; then
+        install_package libpq-dev
+    else
+        install_package postgresql-devel
+    fi
 }
 
 # Remove WSGI files, disable and remove Apache vhost file