Synch ems/add-ems-info with ems/morphemic-rc2.0

See merge request !97

EMS: Control Service, Baguette Server: Added new EMS endpoint '/cluster/command/{clusterId}/{command}' and updated the related EMS server components

duplicate behaviour and only unique variables

See merge request !94

changing Provider enum for openstack

See merge request !90

EMS: Baguette Server: Added 'node-id' client property in active client list/map returned by EMS Info service

EMS: Baguette Server and Client: Added 'SEND-CLIENT-PROPERTY' command in CommandExecutor. Bugfix in CSC (for reporting old client property values)

# Conflicts:
#	.gitlab-ci.yml

EMS: Baguette Server and Client: Added client properties sending from baguette clients to server. Client properties are cached in CSC's

EMS: Baguette Client: Added joinedCluster and leftCluster methods in NodeCallback interface and classes implementing it.

EMS: Baguette Server: Suppressed warnings about matching Node announcements to CSC's based on client-id (reported by client). THIS ISSUE MUST BE FIXED!

EMS: Control Service, Baguette Server, Baguette Client Installer: Extended Node registration to record info at client installation phase too (beyond the preregistration that already existed) [WIP]. Added 'reference' in NodeRegistryEntry, which is included in Info Service provided data. Added endpoint '/baguette/ref/{ref}' for retrieving client SSH connection data using client reference (Intended use by the extends WEBSSH service).

EMS: Reduced logging level from INFO to DEBUG on repeatable interactions between Baguette server and clients (i.e. logging at CSC input processing loop, Heartbeat to baguette clients, SHOW-STATS). Turned off CLUSTER-TEST (instructed by Baguette server clustering strategies).

EMS: Control Server & index.html: Changed REST endpoint for event generator starting (replaced as .../lowerValue-upperValue' with '.../lowerValue/upperValue'; i.e. '-' replaced with '/'). Updated index.html accordingly

EMS: Control Server & Config.: Added translation info in EMS Info service. Changed log level of EMS translator abd Baguette Client installer from DEBUG to INFO.

EMS: Baguette Server and Client: Added client notification on Grouping change completion. Added client grouping in active client list and map (so it is reported by REST API to EMS Web Admin)

EMS: Control Service: Minor fixes in EMS server web security (tested with a devel. version of 'EMS Web Admin' Vuejs app)

EMS: Baguette Client: Modified assembly file to include broker client jar and scripts in installation package

Merge branch 'ems/add-ems-info' of https://gitlab.ow2.org/melodic/melodic-upperware into ems/add-ems-info

EMS: Docker: Updated Dockerfile to download and include JRE8 installation package (to avoid relaying on external resources during demos/reviews)

EMS: Added baguettte client-to-server status change notifications. Added active clients in EMS server info.