Update openstack.common with latest oslo-incubator

openstack.common was updated with the latest oslo-incubator changes.
rpc and notif were manually removed. DB layer was modified to adapt
to the changes done in Oslo. '# noqa' was also removed from imports.

Also after new release of oslo.messaging appeared, we also needed
to update openstack.common to make Climate work with oslo.

Change-Id: I1b5ce64f8d4906d1fcfea9379d115b7bb2ec3f7b
Closes-Bug: #1237896
Closes-Bug: #1284749
Partial-bug: #1253497
Co-Authored-By: Pablo Fernando Cargnelutti <pablo.fernando.cargnelutti@intel.com>
Co-Authored-By: Dina Belova <dbelova@mirantis.com>