Make --vnc_listen configurable
Make --vnc_listen configurable

Change-Id: I3499306f5fd56f602657794632dddb0bb11f2958

sc68cal/devstack,andrewrothstein/devstack,bigswitch/devstack,tianweizhang/devstack,ykaneko/devstack,vsham20/devstack,flavio-fernandes/devstack,parul24/devstack,atulpatil301/devstack,richliu/devstack,samgoon/devstack,citrix-openstack-build/devstack,upadhyay-prashant/devstack,bljgaurav/openstack-test,herrsechs/devstack,shootstar/devstacktest,nuxeh/devstack,ewindisch/raspi-devstack,sc68cal/devstack,pczerkas/devstack,r-mibu/devstack,Juniper/devstack,varunarya10/devstack,flavio-fernandes/devstack,mc2014/devstack,noironetworks/devstack,liuquansheng47/devstack,bq-xiao/devstack,herrsechs/devstack,vsham20/devstack,wenhuizhang/devstack,affo/devstack,upadhyay-prashant/devstack,j4/devstack,vishnugonela/devstack,parul24/devstack,jamielennox/devstack,nawawi/openstack,dirkmueller/devstack,TwinkleChawla/devstack,ozamiatin/devstack,Yuriy-Leonov/devstack,samgoon/devstack,liuquansheng47/devstack,mssumanth/devstack,thomasem/devstack,affo/devstack,savi-dev/devstack,CiscoSystems/devstack,cloudbuilders/devstack,andrewrothstein/devstack,nuxeh/devstack,group-policy/devstack,prithivm/branch01,vishnugonela/devstack,NaokiMiyata/devstack,pczerkas/devstack,sequenceiq/devstack,TwinkleChawla/devstack,CloudServer/devstack,mmasaki/devstack,sequenceiq/devstack,costingalan/devstack,thomasem/devstack,rushiagr/devstack,williamthegrey/devstack,pombredanne/devstack,sstrato/devstack,innodee/openstackk,wenhuizhang/devstack,olivierlemasle/devstack,nati/devstack_public,ewindisch/raspi-devstack,citrix-openstack-build/devstack,nttmcl/devstack_public,avvocatodemarchis/devstack,eshnil2000/devstack,HPCHub/devstack,pacinete/devstack,dtroyer/devstack,kplus/devstack-moonshot,nttmcl/devstack_public,kplus/devstack-moonshot,JioCloud/devstack,nati/devstack_public,armando-migliaccio/devstack,NaokiMiyata/devstack,tianweizhang/devstack,Millnert/contrail-devstack,Mahito/devstack,rushiagr/devstack,olivierlemasle/devstack,savi-dev/devstack,varunarya10/devstack,bljgaurav/openstack-test,ozamiatin/devstack,bq-xiao/devstack,HPCHub/devstack,bswartz/devstack,mc2014/devstack,LoHChina/devstack,noironetworks/devstack,CloudServer/devstack,Mahito/devstack,avvocatodemarchis/devstack,dtroyer/devstack,cloudbuilders/devstack,promptworks/devstack,yamt/devstack,mssumanth/devstack,openstack-dev/devstack,deepakselvaraj/devstack,promptworks/devstack,atulpatil301/devstack,dirkmueller/devstack,bswartz/devstack,r-mibu/devstack,pombredanne/devstack,eharney/devstack,mmasaki/devstack,costingalan/devstack,eharney/devstack,richliu/devstack,LoHChina/devstack,prithivm/branch01,group-policy/devstack,ykaneko/devstack,pacinete/devstack,neerja28/Devstack_GlusterFS,openstack-dev/devstack,nawawi/openstack,BSJAIN92/OpenStack,bigswitch/devstack,virtualopensystems/devstack,j4/devstack,srics/devstack,inkerra/devstack,neerja28/Devstack_GlusterFS,BSJAIN92/OpenStack