ospf6d: SPF consider all Router LSAs

ospf6d: SPF consider all Router LSAs

Based on RFC-5340, there could be multiple Router LSAs
associated with Same Advertising Router. During SPF calculation
ensure first Root Vertex accommodates all Link state IDs for its
originated Router LSAs push them into priority queue.
Similarly follow for other Vertexes, considering Router LSAs
with multiple Link State IDs.

Ticket: CM-18069
Testing Done:
Topology: R1 === R2 -- R3

Validated with more than 100 Subinterfaces
between R1 === R2 with broadcast links,
Validated show ipv6 ospf6 spf tree containing all graph nodes.
Validated ip -6 route at R3 and all intra prefix LSAs route
installed with ospf6 as protocol.

2) Run R1 === R2 with Point-to-Point links.

3) Perform few other abr and ospf6 test cases of LSA ageout,
route install and delete cases.

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>