Config logABug feature for Ceilometer api-ref

Currently, Ceilometer api-ref is not configured with logABug feature.
When users click "Report bug" button, it leads to "openstack-manuals"
which is default.

Change-Id: I61aeaf845ab823434ace0d440c6afaeee5ed71ea

api-ref/source/conf.py

@@ -95,6 +95,15 @@ release = ceilometer_version.version_string_with_vcs()
 # The short X.Y version.
 version = ceilometer_version.canonical_version_string()
 
+# Config logABug feature
+giturl = (
+    u'http://git.openstack.org/cgit/openstack/ceilometer/tree/api-ref/source')
+# source tree
+# html_context allows us to pass arbitrary values into the html template
+html_context = {'bug_tag': 'api-ref',
+                'giturl': giturl,
+                'bug_project': 'ceilometer'}
+
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #