Edge support

See merge request !137

# Conflicts:
#	adapter/pom.xml
#	cp_generator/pom.xml
#	gui-backend/pom.xml
#	melodic-cache/pom.xml
#	melodic-commons/pom.xml

# Conflicts:
#	.gitlab-ci.yml
#	gui-backend/pom.xml

EMS: Broker-CEP, Control Service: Added an extra argument in...

See merge request !133

EMS: Broker-CEP, Control Service: Added an extra argument in 'BrokerCepService.publishSerializable()' methods to control if conversion to JSON is needed.

Removed from .gitlab-ci.yml the unneeded specs about EMS

See merge request !132

EMS RC2.0

See merge request !127

EMS: Control Service: Fixed TopicBeacon to *not* send slo-violation-detector events, if they are going to be empty. Added model version in prediction orchestrator and slo-violation-detector events.

EMS: Control Service: Changed TopicBeacon to *not* send prediction or slo-violation-detector events, if they are going to be empty

User data

See merge request !130

automate byon

See merge request !128

EMS: Baguette Server: Added  'IClusterZoneDetector' interface. Moved 'getZoneIdFor()' methods from 'IZoneManagementStrategy' to the newly added 'IClusterZoneDetector' interface. Removed 'getZoneIdFor()' methods from the classes implementing 'IZoneManagementStrategy'. Added 'ClusterZoneDetector' class, implementing 'IClusterZoneDetector', that determines the cluster/zone id of a node based on node's preregistration info, using a configurable set of rules. Updated 'ClusteringCoordinator' to initialize and use a 'ClusterZoneDetector' instance for determining cluster/zone id, instead of using 'IZoneManagementStrategy' instance. Added sample settings for cluster detector in 'eu.melodic.event.baguette-server.properties'. A few more code and setting improvements.

EMS: Baguette Server: Changed 'ClientShellCommand.run()' method to catch all exceptions during interaction with EMS clients, and exit gracefully.