Remove heat_stack_owner role
Remove heat_stack_owner role

Since https://review.openstack.org/#/c/128509/ heat no longer requires
the "heat_stack_owner" role by default, as we now delegate all roles
via the trust.  So remove the now unnecessary role creation and assignment
from lib/heat.

Change-Id: Ia097ac9a76b3242ed6e62b11ca64c7ac7680b97c

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