Use oslo logging setup.

The one reason we kept our own version was because of the qpid
logging that is quite useful. But this is now easily done via
the "default_log_levels" option.

I have setup the api servers with:
 ampqlib,qpid.messaging,keystone,eventlet
and the engine with:
 ampqlib,qpid.messaging,keystone,eventlet,sqlalchemy

bug: 1143629
Change-Id: I04eeab469ab59da550e08188d53b2cfbb576c04d
Signed-off-by: Angus Salkeld <asalkeld@redhat.com>
Merge "Use oslo logging setup."