Adds keystone roles v2 tests in v3
Adds keystone roles v2 tests in v3

This submission is to add the tests missing in v3 and present in v2.
Submitting roles test cases.

Change-Id: I0e995848ed0019a4895cdff2b70795b5eaf9795a

pandeyop/tempest,Tesora/tesora-tempest,eggmaster/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,JioCloud/tempest,izadorozhna/tempest,redhat-cip/tempest,bigswitch/tempest,afaheem88/tempest,Vaidyanath/tempest,zsoltdudas/lis-tempest,ebagdasa/tempest,Juniper/tempest,bigswitch/tempest,yamt/tempest,akash1808/tempest,roopali8/tempest,afaheem88/tempest,Vaidyanath/tempest,varunarya10/tempest,tonyli71/tempest,xbezdick/tempest,afaheem88/tempest_neutron,pczerkas/tempest,izadorozhna/tempest,tonyli71/tempest,manasi24/jiocloud-tempest-qatempest,flyingfish007/tempest,yamt/tempest,Lilywei123/tempest,danielmellado/tempest,LIS/lis-tempest,neerja28/Tempest,JioCloud/tempest,neerja28/Tempest,manasi24/tempest,cloudbase/lis-tempest,rzarzynski/tempest,jaspreetw/tempest,queria/my-tempest,openstack/tempest,hpcloud-mon/tempest,manasi24/tempest,cisco-openstack/tempest,rakeshmi/tempest,CiscoSystems/tempest,pandeyop/tempest,Juraci/tempest,Lilywei123/tempest,vedujoshi/tempest,Juniper/tempest,nunogt/tempest,hpcloud-mon/tempest,redhat-cip/tempest,LIS/lis-tempest,tudorvio/tempest,alinbalutoiu/tempest,akash1808/tempest,CiscoSystems/tempest,pczerkas/tempest,rzarzynski/tempest,Mirantis/tempest,manasi24/jiocloud-tempest-qatempest,hayderimran7/tempest,tudorvio/tempest,dkalashnik/tempest,sebrandon1/tempest,Mirantis/tempest,sebrandon1/tempest,jaspreetw/tempest,jamielennox/tempest,zsoltdudas/lis-tempest,danielmellado/tempest,vedujoshi/tempest,roopali8/tempest,dkalashnik/tempest,Tesora/tesora-tempest,flyingfish007/tempest,varunarya10/tempest,masayukig/tempest,eggmaster/tempest,alinbalutoiu/tempest,masayukig/tempest,rakeshmi/tempest,Juraci/tempest,NexusIS/tempest,queria/my-tempest,ebagdasa/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,nunogt/tempest,jamielennox/tempest,openstack/tempest,cisco-openstack/tempest,cloudbase/lis-tempest,afaheem88/tempest_neutron,xbezdick/tempest,hayderimran7/tempest,NexusIS/tempest