Fixed RabbitMQ for Murano API tests

Fixed issue with RabbitMQ for automated tests:
 * For tests without deployments we will configure RabbitMQ on the
   localhost to avoid the problems with one RabbitMQ server for
   different tests suites.
 * For tests with deployments we will use the old RabbitMQ configuration
   (created separate script, which allows to deploy Murano with this
    configuration).
 * Fixes small issue with RabbitMQ 'enable plagins' command.

Change-Id: I73389db2d3a8152ea2d60972b610e2a3b91940cb
Merge "Fixed RabbitMQ for Murano API tests"