fix tgt to use 'service' instead of upstart calls

the comments in here were largely about oneric, which we don't
support any more. service is installed in a precise environment,
and will support debian and the upcoming transition to systemd
better, so use that instead.

Change-Id: If15493549a8c93a7387df9b3bba31443aed46995
fix typo in lib/ceilometer

this should be is_service_enabled and not service_enabled. Not
sure why it passes in the gate, but it fails in stackforge jobs.

Change-Id: I876f72cd98ff9c8e4ea28832bc9ac6bbdc3b865d
Merge "fix tgt to use 'service' instead of upstart calls"
Merge branch 'master' of https://github.com/openstack-dev/devstack