Install Guide: Set bug project

Configure the theme so that bug reports go to the
heat queue.

Change-Id: If6457c1595ca9b39a6869c60e3194fb394551be7

install-guide/source/conf.py

@@ -77,7 +77,7 @@ giturl = u'http://git.openstack.org/cgit/openstack/heat/tree/install-guide/sourc
 git_cmd = "/usr/bin/git log | head -n1 | cut -f2 -d' '"
 gitsha = os.popen(git_cmd).read().strip('\n')
 html_context = {"gitsha": gitsha, "bug_tag": bug_tag,
-                "giturl": giturl}
+                "giturl": giturl, "bug_project": "heat"}
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.