Add initial plugin structure

Creates initial module structure and a dummy test.

Change-Id: I7a861dcc800cf3a49da2e317e4780aa5c5027733
Implements: bp tempest-plugin
diff --git a/HACKING.rst b/HACKING.rst
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+barbican_tempest_plugin Style Commandments
+===============================================
+
+Read the OpenStack Style Commandments http://docs.openstack.org/developer/hacking/