This commit majorly consists of the RabbitMQ task which is a required and supported endpoint in bucket notification tests.
And some related changes in the AMQP tests. Major changes are:
1. Addition of RabbitMQ task
2. Documentation update for the steps to execute AMQP tests
3. Addition of attributes to the tests
4. Tox dependency removal from kafka.py
Signed-off-by: Kalpesh Pandya <kapandya@redhat.com>