Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r229385

Fix subtle typo: compare against idx -- not index.

In this context, index refers to the index(3) function. In this case it
doesn't really harm, as this function is never called with idx == NULL.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add bsnmpd(1)'s SNMP client tools (including SNMPv3 support) to the base system.

Sponsored by: The FreeBSD Foundation (the SNMPv3 bits), Google Summer of Code 2005
Reviewed by: philip@ (mostly), bz@ (earlier version based on p4 ch124545)
Approved by: philip@