Bug-607: Segment Routing TLVs parsers/serializers

-added parser/serializer for Path Setup Type Tlv + augmented RP and SRP object
-added parser/serializer for SR PCE Capability Tlv + augmented Open Object
-added parsers/serializers junit tests
-added activator

Change-Id: Ib800bdc12ed78f89e39b3df185e006707bd702b0
Signed-off-by: Milos Fabian <milfabia@cisco.com>
Merge "Bug-607: Segment Routing TLVs parsers/serializers"