Update python-troveclient for Horizon

To support Trove Replication in Horizon we are
dependent on a newer version of the client -
version 1.0.7 which provides the new replication
apis and detach-replica support.

The changes to add replication support to
Horizon are here:
https://review.openstack.org/#/c/114380/

Change-Id: I8d5cb9d090f33f4e07a92e0290beafd379437fa4
Implements: blueprint trove-replication-v1-support
Merge "Update python-troveclient for Horizon"