Add module to the augmented node in the URL path

Add module to the augmented node in the URL path

Phosphorus/Sulfur now require module name for augmented data node
in the URL path. Update the URLs for OpenFlow Plugin tests
to include the module name (flow-node-inventory) for the augmented
nodes (table, group).

Set the expected status code for add/update/delete flow RPC to
204 when the stream is at least Phosphorus, instead of 200,
because the status code for the empty RPC response is 204
since Phosphorus.

Add missing stream-specific keywords in CompareStream.robot up
to Sulfur.

Signed-off-by: Sangwook Ha <sangwook.ha@verizon.com>
Change-Id: Ib2dcb163b001cc23becd29dabd1c23a38c479dfb