Bug-2423: LSP Identifiers TLV in PCEP-SR PCRpt messsage

-LSP Identifier TLV is not included in LSP object of PCRpt
	message for PCEP segment routing

-since building of PCEP topology depends on LSP Identifier,
	lets put fake LSP Identifier (use PLSP ID value)

Change-Id: Idb0ec249a11f343c6071e6bf286fa2cb6f91940f
Signed-off-by: Milos Fabian <milfabia@cisco.com>
(cherry picked from commit 06dd46a992e834d73e526f4a600a8aae4f88a0e0)