XenAPI: Recommend using xl console rather than vncviewer
XenAPI: Recommend using xl console rather than vncviewer

Some vncviewers do not support the -via option, so default to suggesting
xl console.  XenCenter continues to be an option for those running
Windows.

Change-Id: I1e53fd33d309e30a60031965e589167dcbacfbbe

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