Install heat-cfntools and heat-templates repos

These projects contain agents which can be installed on custom
images. Installing these repos will allow a future change to
build a custom image containing these projects. This will allow
gating on any changes in these projects by running heat-slow
on the custom image.
The corresponding devstack-gate change is
https://review.openstack.org/#/c/92055/
Change-Id: I7b1343c094f755f79ddeb1bac3ff4c0daa3fb70c
diff --git a/stackrc b/stackrc
index 595c3db..c1bf018 100644
--- a/stackrc
+++ b/stackrc
@@ -140,6 +140,14 @@
 HEATCLIENT_REPO=${HEATCLIENT_REPO:-${GIT_BASE}/openstack/python-heatclient.git}
 HEATCLIENT_BRANCH=${HEATCLIENT_BRANCH:-master}
 
+# heat-cfntools server agent
+HEAT_CFNTOOLS_REPO=${HEAT_CFNTOOLS_REPO:-${GIT_BASE}/openstack/heat-cfntools.git}
+HEAT_CFNTOOLS_BRANCH=${HEAT_CFNTOOLS_BRANCH:-master}
+
+# heat example templates and elements
+HEAT_TEMPLATES_REPO=${HEAT_TEMPLATES_REPO:-${GIT_BASE}/openstack/heat-templates.git}
+HEAT_TEMPLATES_BRANCH=${HEAT_TEMPLATES_BRANCH:-master}
+
 # django powered web control panel for openstack
 HORIZON_REPO=${HORIZON_REPO:-${GIT_BASE}/openstack/horizon.git}
 HORIZON_BRANCH=${HORIZON_BRANCH:-master}