MFC 338013: bsnmpd(8): fix and optimize interface description processing
* correctly prepare a buffer to obtain interface description from a kernel and truncate long description instead of dropping it altogether and spamming logs; * skip calling strlen() for each description and each SNMP request for MIB-II/ifXTable's ifAlias. * teach bsnmpd to allocate memory dynamically for interface descriptions to decrease memory usage for common case and not to break if long description occurs;
PR: 217763 Reviewed by: harti and others Differential Revision: https://reviews.freebsd.org/D16459
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