Add Load tests

This patch adds the first set of tsung xmls for running performance tests.
Remove REAME.rst
Remove REAME.rst
Merge https://github.com/malini-kamalambal/csi-marconi
Add scenarios with negative tests.

This patch separates the tests into happy path scenarios and
scenarios with negative tests.

blueprint load-test
Add Load Tests

This adds the load tests for Cloud Queueing.