jsonrpc: default args values in wrong order

Default arguments values of a method were passed in wrong order due to
wrong if condition.


Change-Id: I4e256468833851cd4ce866297de916332a560f2f
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Bug-Url: https://bugzilla.redhat.com/1148499
Reviewed-on: http://gerrit.ovirt.org/33882
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>