As part of the Pike goals we are moving api services to run as WSGI
apps. octavia-api service is set up as a wsgi app, and this patch
moves it over to uWSGI.
Since this is just a drop in replacement for the existing eventlet
service, operators an deployers should notice no difference.
Additionally, fix bug whereby git_install_branch was set to
"stable/ocata" for testing.
Change-Id: I0c473977e015015bd252a486c7191a95781b38a4
Implements: blueprint goal-deploy-api-in-wsgi