Creating the framework for an OSC plugin for heat-translator.
This will make adding new commands easier, incorporates them into
OSC, and provides the capabilities of authentication should
it be required in the future (using heatclient after translating
a template).
partially implements bp openstack-client-heat-translator
Change-Id: Ie477eac9acd9ed26f00069947af0d25b3c7e67b1
eb913cd991