core: vmID parameter not passed during jsonrpc call

There was missing parameter when running updateVmPolicy verb.

Bug-Url: https://bugzilla.redhat.com/1142851
Change-Id: I7dea865c9053f3960e2f5eff608d29be388e4080
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>