SRLG TLV system-id present under instances

[raviv-arista]

In ISIS LSDB path, /network-instances/network-instance/protocols/protocol/isis/levels/level/link-state-database/lsp/tlvs/tlv/ipv4-srlg or ../ipv6-srlg has following child nodes ipvx-srlg[instance-number]/state/system-id. Which means all SRLGs are keyed by an arbitrary instance number irrespective of the neighbor it belongs to. This should ideally be first keyed by system-id and then instance-number since each SRLG instance is corresponding to a neighbor link.

This behaviour will be consistent with the existing ../link-state-database/lsp/tlvs/tlv/extended-is-reachability/neighbors/neighbor[system-id]/instances/instance[id]. In extended-is-reachability, instances represent multiple links with the same neighbor.

[dplore]

@rsgcp can you review?

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