Updates Tempest to match Zaqar's API name change

Zaqar is a messaging service which provides support for different
messaging patterns and messaging related semantics.
This fix changes the old API name -queuing- to a more accurate name, -messaging-.

Change-Id: I63321e8b9f277be040d0f75d5ed9f4461da0defc
Merge "Updates Tempest to match Zaqar's API name change"