disable client side libvirt debug logging

and tune server side libvirt logging to the values that danpb
suggested would be useful on the openstack-dev mailing list.

Change-Id: I4b1c780d1dd4d2eecc81fabe42c07cc2a9e0e3f4
Use DATABASE/connection opt for db url in Savanna

DATABASE/sql_connection opt is now deprecated.

Change-Id: I58058f0d51e16de53e6472c8c01065438d709edc
Merge "disable client side libvirt debug logging"
Merge "Use DATABASE/connection opt for db url in Savanna"
Merge branch 'master' of github.com:openstack-dev/devstack