Initial setup of the octavia-tempest-plugin repo

This patch is the initial repository setup for octavia-tempest-plugin
using the OpenStack cookiecutter template.

Change-Id: Icce1389d3a9fb6076091d4d291e15773fb64544b
diff --git a/HACKING.rst b/HACKING.rst
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+octavia-tempest-plugin Style Commandments
+=========================================
+
+Read the OpenStack Style Commandments http://docs.openstack.org/developer/hacking/