Handle failure of openstack endpoint
Handle failure of openstack endpoint

Change 4f7bf6963a1e9ae03bc0ae9189874cba561ad62f introduced finding the
endpoint via "openstack endpoint show" only.  Previously that output
was piped through grep, etc. so it handled fell back to a blank
output when the endpoints were not available.

Ignore failures of this command so the blank output is matched

Change-Id: Iae2f09784ffa38efd2f858513bf284c84c32edac

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