CLOUD-101 azure credentials in db
CLOUD-101 fixed migration
CLOUD-101 fixed tests
Merge pull request #350 from sequenceiq/azure-cer

Azure cer
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