capping python-troveclient version

Verson 1.0 of python-troveclient is not backwards compatible with
the trove work in Horizon. There are too many places to fix the
compatibility issues for Havana, so for now pinning the release
version.

Closes-bug: #1238121

Change-Id: If0ec929180e083aa47bdb688879ba2f63fdcd2a3
Merge "capping python-troveclient version"