Make tuskar element supply tripleo-heat-templates

Tuskar API service requires tripleo-heat-templates on start,
so it's the task of tuskar image element to clone t-h-t git
repo and do a checkout of the given tag or commit id.

Blueprint: tripleo-heat-templates

Change-Id: Ife3ae07bc6ce43e4593b4874cd52be87c900166c

elements/tuskar/README.md

@@ -18,3 +18,14 @@ tuskar:
       - the password of the user to deploy the overcloud on behalf of
     tenant_name:
       - the tenant name of the user to deploy the overcloud on behalf of
+
+Tuskar API uses Heat templates provided by tripleo-heat-templates project.
+One can set the following environment variables to customize how templates
+are obtained:
+
+    - *DIB_REPOTYPE_tuskar-templates* type of repo (git, tar)
+      Defaults to: git
+    - *DIB_REPOLOCATION_tuskar-templates* repo location (uri)
+      Defaults to: git://git.openstack.org/openstack/tripleo-heat-templates
+    - *DIB_REPOREF_tuskar-templates* ref to checkout (for git repos: branch/tag/commit id)
+      Defaults to: master

elements/tuskar/install.d/100-tuskar-api

@@ -6,5 +6,6 @@ os-svc-install -n tuskar -u tuskar -r /opt/stack/tuskar
 
 install -d -m 0750 -o tuskar -g tuskar /etc/tuskar
 cp -a /opt/stack/tuskar/etc/tuskar/policy.json /etc/tuskar
+cp -a /opt/stack/tuskar/etc/tuskar/tripleo-heat-templates /etc/tuskar
 
 os-svc-daemon tuskar-api tuskar tuskar-api "--config-dir /etc/tuskar"

elements/tuskar/source-repository-tuskar

@@ -1 +1,2 @@
 tuskar git /opt/stack/tuskar https://git.openstack.org/cgit/openstack/tuskar
+tuskar-templates git /opt/stack/tuskar/etc/tuskar/tripleo-heat-templates https://git.openstack.org/cgit/openstack/tripleo-heat-templates