Update nova-core membership
Update nova-core membership

Change-Id: I3a69e957ee738a9b2c7ec28eaf7da6bba298f580

cp16net/reviewstats,JohnGarbutt/reviewstats,openstack-infra/reviewstats,openstack-infra/reviewstats,cp16net/reviewstats,JohnGarbutt/reviewstats