match generic cirros name

devstack/tempest removed cirros ami image for qcow image[1][2]. this changes
suffix of file. this patch generically looks for first cirros match and
disregards suffix

[1] https://review.openstack.org/#/c/338435/
[2] https://review.openstack.org/#/c/338377/

Change-Id: Iefcfe839916e0501cd82daa6f538b440a8d8ee96
diff --git a/ceilometer/tests/integration/hooks/post_test_hook.sh b/ceilometer/tests/integration/hooks/post_test_hook.sh
index 6a8567a..68acf1a 100755
--- a/ceilometer/tests/integration/hooks/post_test_hook.sh
+++ b/ceilometer/tests/integration/hooks/post_test_hook.sh
@@ -95,7 +95,7 @@
 export GNOCCHI_SERVICE_URL=$(openstack catalog show metric -c endpoints -f value | awk '/public/{print $2}')
 export HEAT_SERVICE_URL=$(openstack catalog show orchestration -c endpoints -f value | awk '/public/{print $2}')
 export NOVA_SERVICE_URL=$(openstack catalog show compute -c endpoints -f value | awk '/public/{print $2}')
-export GLANCE_IMAGE_NAME=$(openstack image list | awk '/ cirros.*uec /{print $4}')
+export GLANCE_IMAGE_NAME=$(openstack image list | awk '/ cirros.* /{print $4; exit}')
 export ADMIN_TOKEN=$(openstack token issue -c id -f value)
 
 # Run tests with gabbi