Add links in HOT Guide to collections of existing templates.

There is not yet a central repository for Heat templates, but in
the mean time a list of links to collections of existing Heat
templates will be very helpful. This change adds one page to the
HOT Guide with links to several repositories. The latest patchset
should clear up the tox checks.

Closes-Bug: #1425581

Change-Id: I1949a8379d1d598cf399d37b4ddb87b549cfa7e6

doc/hot-guide/source/existing_templates.rst

@@ -0,0 +1,28 @@
+.. _existing_templates:
+
+================================
+Where to find existing templates
+================================
+
+There are several repositories where you can find existing tested HOT
+templates.
+
+
+The `OpenStack Heat Templates repository`_ is a collection of example
+templates which demonstrates core Heat functionality, related image-building
+templates, template-related scripts and conversion tools.
+
+.. _OpenStack Heat Templates Repository: http://git.openstack.org/cgit/openstack/heat-templates/tree/
+
+The `OpenStack TripleO Heat Templates repository`_ contains a variety of
+heat templates that are included in the tripleo-heat-templates codebase.
+
+.. _OpenStack TripleO Heat Templates repository: http://git.openstack.org/cgit/openstack/tripleo-heat-templates/tree/
+
+Rackspace has provided a set of Heat templates at the `RCB Ops repository`_
+that can be used by cloud operators to launch applications, templates for
+building a multi-node OpenStack cluster, as well as templates for CI
+development. Heat templates for deployment of Magento, Hadoop, MongoDB,
+ELK, Drupal and more can be found here.
+
+.. _RCB Ops repository: http://github.com/rcbops/

doc/hot-guide/source/index.rst

@@ -10,5 +10,6 @@ HOT guide
    software_deployment
    environment
    composition
+   existing_templates
    #advanced_topics
    #functions