adding grouping details in metadata service
Merge branch '4.0.0-grouping' of https://git-wip-us.apache.org/repos/asf/stratos into 4.0.0-grouping

Conflicts:
	components/org.apache.stratos.metadataservice/src/main/java/org/apache/stratos/metadataservice/definition/ApplicationBean.java
	components/org.apache.stratos.metadataservice/src/main/java/org/apache/stratos/metadataservice/services/MetaDataAdmin.java