Update python-troveclient version

Reasons:
 - openstack pypi contains new version - 1.0.3;
 - current version in requirements 1.0.0.
Changes:
 - updating python-troveclient version from 1.0.0 to 1.0.3

Change-Id: Ic725596f50aee5fdb7c7c974deae73d42b7bb780
Merge "Update python-troveclient version"