Add module to the table URL segment in ScaleClient.py

Add module to the table URL segment in ScaleClient.py

In Phosphorus/Sulfur URL without the module name for
the augmented data node, i.e. the table list augmented to
opendaylight-inventory, returns 409 error. Add the module
name 'flow-node-inventory' to the path segment to address
the issue.

And add a step to break out of request loop in ScaleClient.py
if there are many request errors (more than 10) to prevent
the overall test from failing to complete (or taking too long).

Signed-off-by: Sangwook Ha <sangwook.ha@verizon.com>
Change-Id: I9b7225c90160836fa1f2ad0ab2e492593cebc4b5