Add rabbitmq-client in opennaas.
Merge branch 'develop' of https://github.com/dana-i2cat/opennaas into feature/rabbit-mq
SLAManager observation pusher client.

Allows pushing observations to SLAManager using rabbitMQ.

RabbitMQ info:
- API JavaDoc: http://www.rabbitmq.com/releases/rabbitmq-java-client/v3.2.4/rabbitmq-java-client-javadoc-3.2.4/
- API guide: http://www.rabbitmq.com/api-guide.html

WARNING: Untested. There is no server to test with.
Merge branch 'develop' of https://github.com/dana-i2cat/opennaas into rabbit-mq

Conflicts:
	pom.xml
Merge pull request #3 from adrian-rosello/rabbit-mq

Merge rabbit-mq branch with develop
Merge pull request #882 from isartcanyameres/feature/rabbit-mq

RabbitMQ

Client to send observations to SLAManager.

The client uses a rabbitMQ java client to communicate with the rabbitMQ broker where SLAManager is listening to.
FlowData could contain comma-separated-values.
NetworkStatisticsPoller skeleton.
NetworkStatisticsPoller implementation, except of csv parsing.
Parse timedPortStatistics to CSV.
Merge branch 'develop' of https://github.com/dana-i2cat/opennaas into statistics-rabbitmq
NetworkObservations pusher.
Documment network observation pusher and refactor constant name.
Ignore tests for real rabbit mq server.
Add rabbitmq feature to genericnetwork feature.
Merge branch 'ofertie/monitoring' of https://github.com/dana-i2cat/opennaas into statistics-rabbitmq
Add sample user registry and class that reads the user registry file.
Use Notification client to notify circuir related information to sdn module.
Move userManagement to NCL Provisioner module.
Merge pull request #960 from adrian-rosello/ofertie/user-registry

Add sample user registry and class that reads the user registry file.