Implemented subparsers (bp keystone-manage2)
Implemented subparsers (bp keystone-manage2)

Using subparsers improves CLI feedback and simplifies the way we handle
commands.

Change-Id: I6fa3a6f056f408b5af2d95bb5650f7c9a76c00be

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