BindingXMLRPC cleanup: Remove unused variables

Change-Id: I1d36a9f71b4d192b8ba825e95055dd42fc278248
Signed-off-by: Assaf Muller <amuller@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/22836
Reviewed-by: Dan Kenigsberg <danken@redhat.com>