Change the ceilometer's git repository.

Changed the ceilometer's git repository from stackforge/ceilometer.git
to openstack/ceilometer.git.

Change-Id: I8cf1854641fc7df318f42a56ba061c93614728aa
diff --git a/stackrc b/stackrc
index 5be872b..a02bdc0 100644
--- a/stackrc
+++ b/stackrc
@@ -28,7 +28,7 @@
 GIT_BASE=https://github.com
 
 # metering service
-CEILOMETER_REPO=https://github.com/stackforge/ceilometer.git
+CEILOMETER_REPO=${GIT_BASE}/openstack/ceilometer.git
 CEILOMETER_BRANCH=master
 
 # volume service