Handle trove service availabilty in tempest.
Handle trove service availabilty in tempest.

Partially implements blueprint: trove-tempest
Change-Id: I5413a7afeffe670f6972b41d61dd27ed05da5ba2

thomasem/devstack,nuxeh/devstack,neerja28/Devstack_GlusterFS,Mahito/devstack,bljgaurav/openstack-test,eharney/devstack,pczerkas/devstack,richliu/devstack,sc68cal/devstack,dtroyer/devstack,pacinete/devstack,thomasem/devstack,Mahito/devstack,HPCHub/devstack,promptworks/devstack,ozamiatin/devstack,flavio-fernandes/devstack,andrewrothstein/devstack,innodee/openstackk,rushiagr/devstack,vishnugonela/devstack,pacinete/devstack,dtroyer/devstack,CloudServer/devstack,bq-xiao/devstack,NaokiMiyata/devstack,richliu/devstack,virtualopensystems/devstack,kplus/devstack-moonshot,herrsechs/devstack,herrsechs/devstack,upadhyay-prashant/devstack,parul24/devstack,dirkmueller/devstack,olivierlemasle/devstack,flavio-fernandes/devstack,mc2014/devstack,BSJAIN92/OpenStack,LoHChina/devstack,promptworks/devstack,noironetworks/devstack,atulpatil301/devstack,vishnugonela/devstack,tianweizhang/devstack,group-policy/devstack,sc68cal/devstack,NaokiMiyata/devstack,j4/devstack,eharney/devstack,nawawi/openstack,samgoon/devstack,noironetworks/devstack,varunarya10/devstack,vsham20/devstack,pombredanne/devstack,mssumanth/devstack,kplus/devstack-moonshot,dirkmueller/devstack,j4/devstack,samgoon/devstack,HPCHub/devstack,mmasaki/devstack,prithivm/branch01,liuquansheng47/devstack,upadhyay-prashant/devstack,olivierlemasle/devstack,tianweizhang/devstack,sequenceiq/devstack,prithivm/branch01,costingalan/devstack,yamt/devstack,avvocatodemarchis/devstack,Juniper/devstack,pombredanne/devstack,TwinkleChawla/devstack,bigswitch/devstack,openstack-dev/devstack,mssumanth/devstack,LoHChina/devstack,costingalan/devstack,openstack-dev/devstack,Millnert/contrail-devstack,vsham20/devstack,atulpatil301/devstack,liuquansheng47/devstack,BSJAIN92/OpenStack,parul24/devstack,bq-xiao/devstack,nawawi/openstack,affo/devstack,andrewrothstein/devstack,bswartz/devstack,bswartz/devstack,affo/devstack,pczerkas/devstack,neerja28/Devstack_GlusterFS,bljgaurav/openstack-test,group-policy/devstack,CloudServer/devstack,mc2014/devstack,varunarya10/devstack,bigswitch/devstack,JioCloud/devstack,avvocatodemarchis/devstack,mmasaki/devstack,ozamiatin/devstack,TwinkleChawla/devstack,eshnil2000/devstack,nuxeh/devstack,wenhuizhang/devstack,srics/devstack,wenhuizhang/devstack,jamielennox/devstack,rushiagr/devstack,williamthegrey/devstack,sequenceiq/devstack