To deprecate and drop support for neutronclient CLI and use only
OSC we need feature parity between OSC and neutronclient.
Last missing piece here is possibility to send in POST/PUT requests
unknown parameters to the Neutron server.
This patch adds such possibility to the OSC.
Change-Id: Iba09297c2be9fb9fa0be1b3dc65755277b79230e
b26b7f3440