Trove services restarting issue on conf update

In case of trove-api service config file modification (trove.conf file),
trove-conductor and trove-taskmanager are restarted too, but they should
not.

trove-conductor startup command:
https://github.com/openstack/kolla-ansible/blob/master/ansible/roles/trove/templates/trove-conductor.json.j2#L2
=> trove.conf is not used

trove-taskmanager startup command:
https://github.com/openstack/kolla-ansible/blob/master/ansible/roles/trove/templates/trove-taskmanager.json.j2#L2
=> trove.conf is not used

Change-Id: Ic4703a571cec5bf8b3f91cfcb9da1a23e2bb300b
Closes-Bug: #1677531