xenapi: add username to vncviewer command
xenapi: add username to vncviewer command

Devstack prints out an instruction, how to look at the virtual machine's
console. The command did not include the username, so if the user had a
config file to use a different username for that network, the command
failed.

Change-Id: I5dd49169c45e26e8d2bb3d5920a1b7fa584be50f

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