CLOUD-282 add stack id and name to CloudbreakEventJson
Merge pull request #360 from sequenceiq/events-json

CLOUD-282 add stack id and name to CloudbreakEventJson
CLOUD-290 do not allow to decommission any host group which contains a MASTER service
CLOUD-290 error handling for bad requests when decommission
CLOUD-290 service component check moved to upper to give proper information to the user
CLOUD-290 do not allow multiple scaling group in one request