Bug-2208: On session-up reported LSPs have one hop path.

-all reported LSPs have common tunnel endpoint + one hop path (ERO with one ipv4-prefix subobject)

Change-Id: Ib358bccce79e4e41020dddecfcf5476c010fc8fe
Signed-off-by: Milos Fabian <milfabia@cisco.com>