Identity REST service

Name	Serive URL	Location	Description
IdentityRestService	restContextName}/{portalName}/social/identity/{username}/id	Maven groupId: org.exoplatform.social ArtifactId: exo.social.component.service	Get identityId by the username.

Name	Service URL Endpoint	Parameters	Expected Values	Description
UserId getId	{restContextName}/{portalName}/social/identity/{username}/id/show.json	username portalName	String String	Get the identity by username and return by the JSON format.