Restructure ARA ansible plugins into it's own tree

This is not backwards compatible -- it requires users to change
the path to their callback library according to the documentation.
This change will make it easier to introduce additional plugins such
as an ARA Ansible action module.

Change-Id: I1fa15d3af2310114aa02443c20ded34323e05e01

doc/source/configuration.rst

@@ -11,9 +11,9 @@ Set up your `ansible.cfg`_ file to seek that callback in the appropriate
 directory. Here's an example that covers most common locations::
 
     [defaults]
-    callback_plugins = /usr/lib/python2.7/site-packages/ara/callback:$VIRTUAL_ENV/lib/python2.7/site-packages/ara/callback:/usr/local/lib/python2.7/dist-packages/ara/callback
+    callback_plugins = /usr/lib/python2.7/site-packages/ara/plugins/callbacks:$VIRTUAL_ENV/lib/python2.7/site-packages/ara/plugins/callbacks:/usr/local/lib/python2.7/dist-packages/ara/plugins/callbacks
 
-.. _callback: https://github.com/dmsimard/ara/blob/master/ara/callback/log_ara.py
+.. _callback: https://github.com/dmsimard/ara/blob/master/ara/plugins/callbacks/log_ara.py
 .. _ansible.cfg: http://docs.ansible.com/ansible/intro_configuration.html#configuration-file
 
 *That's it!*

run_tests.sh

@@ -17,7 +17,7 @@ tox -e venv --notest
 source .tox/venv/bin/activate
 
 # Setup ARA
-export ANSIBLE_CALLBACK_PLUGINS="ara/callback"
+export ANSIBLE_CALLBACK_PLUGINS="ara/plugins/callbacks"
 export ARA_DATABASE="sqlite:///${DATABASE}"
 
 # Run test playbooks

tests/unit/test_callback.py

@@ -5,7 +5,7 @@ import random
 import ara.webapp as w
 import ara.models as m
 import ara.utils as u
-import ara.callback.log_ara as l
+import ara.plugins.callbacks.log_ara as l
 
 from mock import Mock