Update trove job to install trove tempest plugin
Update trove job to install trove tempest plugin

Currently the gate-tempest-dsvm-trove job fails because tempest does
not know the entry point for the trove tempest plugin. This change
updates the gate-tempest-dsvm-trove job to install the Trove tempest
plugin in the tempest venv.

Change-Id: I28f8b29b0193725ea2514594ff5f4946ad0762a9

openstack-infra/project-config,Tesora/tesora-project-config,openstack-infra/project-config,Tesora/tesora-project-config