Use openstack/requirements for keystone
Use openstack/requirements for keystone

See Iccb4e99f8e4b6659a19c1817d0f4c697824af25c for context.

Change-Id: Ic4f5732e70b0cda3b3755e8fe33ece3116fa8afc
Partial-Bug: #150530

negronjl/kolla,mandre/kolla,nihilifer/kolla,negronjl/kolla,GalenMa/kolla,coolsvap/kolla,tonyli71/kolla,intel-onp/kolla,mandre/kolla,rahulunair/kolla,dardelean/kolla-ansible,stackforge/kolla,rajalokan/kolla,coolsvap/kolla,openstack/kolla,mrangana/kolla,limamauricio/mykolla,dardelean/kolla-ansible,toby82/kolla,mandre/kolla,nihilifer/kolla,intel-onp/kolla,rajalokan/kolla,limamauricio/mykolla,dardelean/kolla-ansible,negronjl/kolla,rahulunair/kolla,limamauricio/mykolla,toby82/kolla,GalenMa/kolla,tonyli71/kolla,rajalokan/kolla,toby82/kolla,mrangana/kolla,coolsvap/kolla,stackforge/kolla,openstack/kolla,stackforge/kolla