Add DatasetNamespace.contains()
Addressed comments
Merge pull request #852 from caskdata/feature/improve-dataset-namespace

Add DatasetNamespace.contains()
Merge pull request #843 from caskdata/feature/CDAP-869-namespaced-program-lifecycle

Feature/cdap 869 namespaced program lifecycle
Merge branch 'develop' into feature/namespaced-program-list