Assign ID to incidence, validate RTR port, fix slurm bug.

Assign ID to incidence, validate RTR port, fix slurm bug.

-Use an ID for the registered incidence.
-When loading multiple SLURM files, the validation from RFC 8416 section 4.2 wasn't considered. A context is used to perform such validation, since every prefix or asn (for bgpsec) must be validated according to its own context/file.
-Remove dead code (structs) from SLURM.
-Validate RTR port range since this isn't validated by getaddrinfo.