Update openstack-common in prep for graceful stop

Now at oslo-incubator version 95c7598917c7cd16f68a253a2048c21b3df9dfda

Change-Id: I2655ba2b9a0fb5048576f2b738d2af52c76c1d05
Partial-Bug: #1304244
Merge "Update openstack-common in prep for graceful stop"