don't check for service enabled

service enabled is something that's not required for sysstat and
friends, because instead we actually can do this with screen_it.

Change-Id: I4aa5787101cb0def46690f38a7f82effbb85f502
match devstack-gate format

support millisecond resolution and the | separator for ts vs.
content.

everything else in openstack is running at millisecond resolution,
and some times it's actually useful to see that when debugging
gate failures.

Change-Id: I2227ab0b4965cd1a24b579bdf2ba8c1f9a432f70
Merge "match devstack-gate format"