Migrate scenario utils to tempest client
Migrate scenario utils to tempest client

All scenario tests have been migrated to tempest client.
Migrate scenario utils as well, so that we may drop
the OfficialClientManager completely.

Change-Id: I3ec80de961ba289734f9bc811e4789e7d1b5903c
Partially-implements: bp/tempest-client-scenarios

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