Add reseller admin capability.
Add reseller admin capability.

- A user with the reseller admin role will be able to access to every
  other accounts.
- Rename name groups to roles.

Change-Id: I8e86d8280a8fcdefbd4f9386bec11afdad797167

cbrucks/Federated_Keystone,ilay09/keystone,roopali8/keystone,jamielennox/keystone,nuxeh/keystone,citrix-openstack-build/keystone,rodrigods/keystone,sileht/deb-openstack-keystone,jumpstarter-io/keystone,ntt-sic/keystone,kwss/keystone,vivekdhayaal/keystone,derekchiang/keystone,jonnary/keystone,dstanek/keystone,citrix-openstack-build/keystone,cbrucks/Federated_Keystone,maestro-hybrid-cloud/keystone,mahak/keystone,rushiagr/keystone,ntt-sic/keystone,promptworks/keystone,ging/keystone,cloudbau/keystone,jumpstarter-io/keystone,reeshupatel/demo,takeshineshiro/keystone,dims/keystone,rushiagr/keystone,jonnary/keystone,openstack/keystone,jamielennox/keystone,derekchiang/keystone,ajayaa/keystone,cloudbau/keystone,ajayaa/keystone,rickerc/keystone_audit,rajalokan/keystone,dims/keystone,promptworks/keystone,promptworks/keystone,UTSA-ICS/keystone-kerberos,dstanek/keystone,savi-dev/keystone,rodrigods/keystone,maestro-hybrid-cloud/keystone,JioCloud/keystone,reeshupatel/demo,rickerc/keystone_audit,citrix-openstack-build/keystone,himanshu-setia/keystone,cernops/keystone,dsiddharth/access-keys,idjaw/keystone,sileht/deb-openstack-keystone,savi-dev/keystone,openstack/keystone,takeshineshiro/keystone,ilay09/keystone,cernops/keystone,klmitch/keystone,dsiddharth/access-keys,cbrucks/keystone_ldap,nuxeh/keystone,dsiddharth/access-keys,ilay09/keystone,openstack/keystone,jumpstarter-io/keystone,kwss/keystone,mahak/keystone,kwss/keystone,roopali8/keystone,MaheshIBM/keystone,ging/keystone,rushiagr/keystone,cbrucks/Federated_Keystone,ntt-sic/keystone,derekchiang/keystone,rickerc/keystone_audit,savi-dev/keystone,reeshupatel/demo,cbrucks/keystone_ldap,himanshu-setia/keystone,dstanek/keystone,rajalokan/keystone,cbrucks/keystone_ldap,blueboxgroup/keystone,nuxeh/keystone,townbull/keystone-dtrust,townbull/keystone-dtrust,JioCloud/keystone,blueboxgroup/keystone,sileht/deb-openstack-keystone,vivekdhayaal/keystone,townbull/keystone-dtrust,mahak/keystone,UTSA-ICS/keystone-kerberos,idjaw/keystone,klmitch/keystone,cloudbau/keystone,vivekdhayaal/keystone,rajalokan/keystone,MaheshIBM/keystone