src/sbin string functions cleanup

[Andre Nathan]

Hello folks.

The paches at [1] substitute all calls to strcpy, strcat, strncpy,
strncat and sprintf by the safer strlcpy, strlcat and snprintf for
everything under src/sbin.

Most of the changes are trivial but some patches are somewhat big, so
it would be nice if other eyes had a look at them to see if I broke
something :p

BTW, would you prefer a big patch with all the changes instead of one
patch per program?

Best regards,
Andre

[1]http://andre.people.digirati.com.br/dragonfly/patches/hunt/sbin/