Update to RFC 8664 (PCEP Segment Routing)

Update to RFC 8664 (PCEP Segment Routing)

As per RFC 8664, this commit introduces following changes:
 - Add Flags N & X to SR PCE Capability
 - Add Ipv6 Local Nai Type and rename SID Type to NAI Type (NT) in
   odl-pcep-segment-routing-yang
 - Change IANA type (=36) for SR-ERO and SR-RRO to be the default value in
   pcep-segment-routing-app-config.yang instead of Legacy Type values
 - Update yang model revision
 - Turn IANA Type as the defaut for Segement Routing parser registration
 - Mark deprecated all IANA Type configuration (this will be removed in next
   release after Aluminium)
 - Add extra verifications to AbstractSrSubobjectParser Java Class and support
   for Ipv6Local NAI
 - Update accordingly Segment Routing Junit Tests

JIRA: BGPCEP-882
Change-Id: Ic6dc01329af87a317154f742d7e698cc9d752df0
Signed-off-by: Olivier Dugeon <olivier.dugeon@orange.com>
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>