vz: added VIR_MIGRATE_PARAM_BANDWIDTH param handling
vz: added VIR_MIGRATE_PARAM_BANDWIDTH param handling

libvirt-python passes parameter bandwidth = 0
by default. This means that bandwidth is unlimited.
VZ driver doesn't support bandwidth rate limiting,
but we still need to handle it and fail if bandwidth > 0.

Signed-off-by: Pavel Glushchak <a01950bf8d7d49f8f7ea5c1c62fa9db3304a0d63@virtuozzo.com>

VenkatDatta/libvirt,datto/libvirt,olafhering/libvirt,zippy2/libvirt,zippy2/libvirt,zippy2/libvirt,datto/libvirt,eskultety/libvirt,fabianfreyer/libvirt,taget/libvirt,jardasgit/libvirt,taget/libvirt,nertpinx/libvirt,crobinso/libvirt,jardasgit/libvirt,libvirt/libvirt,datto/libvirt,taget/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,jfehlig/libvirt,eskultety/libvirt,olafhering/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,libvirt/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,libvirt/libvirt,crobinso/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,nertpinx/libvirt,crobinso/libvirt,datto/libvirt,olafhering/libvirt,VenkatDatta/libvirt,crobinso/libvirt,taget/libvirt,taget/libvirt,nertpinx/libvirt,libvirt/libvirt,jfehlig/libvirt,datto/libvirt,olafhering/libvirt,eskultety/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jfehlig/libvirt,andreabolognani/libvirt,nertpinx/libvirt,eskultety/libvirt,eskultety/libvirt,VenkatDatta/libvirt