Standardize some log messages and fix some inconsistencies.

We were using several different names for the same thing in our log
messages: neighbor, neighbor ID, nbr ID and LSR ID.

Standardize to always use "lsr-id" to refer to a neighbor.

Also:
* Use log_warnx() instead of log_warn() when appropriate;
* Use fatal(x) instead of err(x) when appropriate;
* Fix some inconsistent log messages.

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