[DM] Changing the deployment implementation to openstack4j
* Use openstack4j library instead of raw HTTP requests
* Added latest openstack4j-3.0.3-SNAPSHOT to dependencies
* Added re-authentication of openstack4j client
* Minor code refactoring
[DeploymentManager] Multi-env configuration support
User can put several configurations for different
types of Murano-environment. Object model for
each environment placed to a separate file.
Minor code reformatting.