Add an ability to build docs using tox

It is possible to use "tox -edocs"

Change-Id: I427d78265e37aff256eecaf6d2fd12eb0a9a725e

docs/source/description.rst

@@ -22,7 +22,7 @@ Requirements
 ======================= ================
 Requirements            Version/Comment
 ======================= ================
-MOS                     9.0
+Mirantis OpenStack      9.x
 ======================= ================
 
 .. _limitations:
@@ -32,10 +32,8 @@ Limitations
 
 * Kafka supports authentication, encryption and authorization. Current version of the
   plugin doesn't support any form of security, meaning that the Kafka cluster will be
-  “open” on the management network. We plan to support some level of security in future
-  versions of the plugin.
+  “open” on the management network.
 
 * Kafka Plugin will not expose configuration properties for all the broker configuration parameters.
   This means that the Kafka broker configuration set by the plugin will not be appropriate for every
-  usage. In the future, we may make the Fuel plugin more configurable by adding new configuration
-  properties.
+  usage.

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = manifests,build_plugin
+envlist = manifests,build_plugin,docs
 skipsdist = True
 
 [testenv]
@@ -17,6 +17,12 @@ commands =
     bundle install --path {toxinidir}/.bundled_gems
     bundle exec rake test
 
+[testenv:docs]
+changedir = {toxinidir}/docs
+whitelist_externals = make
+commands =
+    make clean html SPHINXOPTS=-W
+
 [testenv:build_plugin]
 changedir = {toxinidir}
 whitelist_externals =