Included OpenStack integration tests.

 - Included OpenStack KafkaProducer and consumer integration tests for:
   - alarm_request
   - metrics_request
   - access_credentials
 - Included a webserver integration test for Aodh notifier class

Change-Id: I742c146269a2c60d004402d6614e529babeb2acd
Signed-off-by: Helena McGough <helena.mcgough@intel.com>