If we need to start and stop, it's best to use playbooks.
We already have tasks files with start commands in each role,
so put the stop commands into similar task files.
Make the restart playbook import_playbook the stop and start
playbooks to reduce divergence.
Use the graceful shutdown pattern from the gerrit docker-compose
to stop the zuul scheduler.
Change-Id: Ia20124553821f4b41186bce6ba2bff6ca2333a99
Remove some old ones which were in the wrong place and out of date.
Change-Id: I4303e66edc7d3dc00c455a0990b0b3be0f5f91a6
Depends-On: https://review.openstack.org/586699
