BUG 2412 - restconf @GET getModule(identifier,uri) method migration

* migration to new faster Infrastructure API and Codecs for method
@GET getModules(String,UriInfo) on @Path {/modules/identifier}

New faster Infrastructure API works with NormizedNodeContext and
we are replacing first method getModule(URI) from RestconfService
to use NormalizedNodeContext.

* add yang models for fix tests (mountpoint tests - TestUtility
loads modules from local directory only)

Change-Id: I394d6d31f650e086ce302a0ba973f1e4a4599ef8
Signed-off-by: Vaclav Demcak <vdemcak@cisco.com>