restapi : Add /applications sub-collection under vm(#926928)

Add /applications sub-collection under vm

Change-Id: I8b7db49d2cc7b47c39ef3d4fff261a99c24dae42
Bug-Url: https://bugzilla.redhat.com/926928
Signed-off-by: Ravi Nori <rnori@redhat.com>