Adjust log style and remove ocata support
Adjust log style and remove ocata support

we already passed Pike cycle and should require compute to have
Pike+ version, the backport to Ocata can be removed.

Change-Id: I39d93dbf8552605e34b9f146e3613e6af62a1774

gooddata/openstack-nova,mahak/nova,openstack/nova,mahak/nova,mikalstill/nova,gooddata/openstack-nova,gooddata/openstack-nova,mahak/nova,mikalstill/nova,openstack/nova,rahulunair/nova,klmitch/nova,klmitch/nova,klmitch/nova,rahulunair/nova,rahulunair/nova,klmitch/nova,gooddata/openstack-nova,mikalstill/nova,openstack/nova