Be more explicit with Nordix CICD ONAP stack name

Be more explicit with Nordix CICD ONAP stack name

We need to differentiate between user initiated deployments
and CICD ones so we know who created a certain stack.

For CICD deployments, stack name will be in following form
  nordix-cicd-onap-{onap-branch}-{onap-flavor}
such as
  nordix-cicd-onap-master-full
  nordix-cicd-onap-dublin-core

For user initiated deployments, stack name will be set to
something random in following form in engine
  nordix-custom-onap-{random-string}
such as
  nordix-custom-onap-aglee

Change-Id: I145d8a6f4e3d624ef723f8decfbab0ce5297f45a