Fix error message when TUNNELLED flag is used in non-p2p migration
Fix error message when TUNNELLED flag is used in non-p2p migration

The current error message is

    error: use virDomainMigrateToURI3 for peer-to-peer migration

which is correct but a bit misleading because the client did not specify
VIR_MIGRATE_PEER2PEER flag. This patch changes the error message to

    error: cannot perform tunnelled migration without using peer2peer
    flag

which is consistent with the error reported by older migration APIs.

Reported by Rich Jones in
https://bugzilla.redhat.com/show_bug.cgi?id=1095924

VenkatDatta/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,eskultety/libvirt,jardasgit/libvirt,jardasgit/libvirt,zippy2/libvirt,elmarco/libvirt,VenkatDatta/libvirt,rlaager/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,agx/libvirt,fabianfreyer/libvirt,taget/libvirt,andreabolognani/libvirt,eskultety/libvirt,olafhering/libvirt,zippy2/libvirt,jfehlig/libvirt,nertpinx/libvirt,andreabolognani/libvirt,agx/libvirt,shugaoye/libvirt,zippy2/libvirt,andreabolognani/libvirt,rlaager/libvirt,taget/libvirt,elmarco/libvirt,agx/libvirt,jardasgit/libvirt,olafhering/libvirt,VenkatDatta/libvirt,elmarco/libvirt,nertpinx/libvirt,libvirt/libvirt,fabianfreyer/libvirt,elmarco/libvirt,shugaoye/libvirt,shugaoye/libvirt,crobinso/libvirt,libvirt/libvirt,shugaoye/libvirt,eskultety/libvirt,datto/libvirt,andreabolognani/libvirt,crobinso/libvirt,zippy2/libvirt,fabianfreyer/libvirt,datto/libvirt,datto/libvirt,VenkatDatta/libvirt,crobinso/libvirt,jardasgit/libvirt,libvirt/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,agx/libvirt,taget/libvirt,rlaager/libvirt,eskultety/libvirt,olafhering/libvirt,eskultety/libvirt,taget/libvirt,jfehlig/libvirt,jfehlig/libvirt,datto/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,rlaager/libvirt,andreabolognani/libvirt,agx/libvirt,olafhering/libvirt,rlaager/libvirt,jfehlig/libvirt,shugaoye/libvirt,datto/libvirt,elmarco/libvirt,taget/libvirt