Update solum core-team
Update solum core-team

Change-Id: Ic01f4b9697b2f387fb47242d6d52f19d2b2c036e

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