Fix tempest.conf generation
Fix tempest.conf generation

[service_available] isn't being generated. This patch fixes it.

Change-Id: I9078947dda48fcae96312c6886b0a674277b8bad
Co-Author: Matthew Treinish <4efabb057cc143e1042444743947010c1661479a@kortar.org>

bswartz/manila,openstack/manila,NetApp/manila,NetApp/manila,vponomaryov/manila,bswartz/manila,vponomaryov/manila,openstack/manila