jsonrpc: Host_stopMonitoringDomain

Align naming between API.py and schema.

Change-Id: If7858600128096c4d8c985a9a6d4a4857521060e
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/35526
Reviewed-by: Adam Litke <alitke@redhat.com>