Repeatedly add log_filters,log_outputs to libvirtd.conf when restart

Change-Id: I14f07f3164f9201305ed1e94e9277a5a5792e850
Closes-bug: 1273058
Fix Swift process kill

stop_swift() was not killing all swift processes properly.  Change to
manually clean up all screen services with pkill.

Closes-bug: 1268794
Change-Id: Ibb7a2e0dd10a313609f05963264087f82f6f00e2
Convert trove to plugin

Also adds an is_trove_enabled() function to match
https://review.openstack.org/69497 changes for is_service_enabled().

Change-Id: Ic0408ff6d9816aec8a3506931470470342a5dcd7
Merge "Fix Swift process kill"
Merge "Repeatedly add log_filters,log_outputs to libvirtd.conf when restart"
Merge "Convert trove to plugin"
Merge branch 'master' of github.com:openstack-dev/devstack