CTLTYPE_UINT?

[Justin Cormack <justin%specialbusservice.com@localhost>]

Back in the sysctl discussion a while back, core group said:

http://mail-index.netbsd.org/tech-kern/2014/03/26/msg016779.html

a) What types are needed?  Currently, CTLTYPE_INT is a signed
   32-bit type, and CTLTYPE_QUAD is an unsigned 64-bit type.
   Perhaps all four possible combinations of signed/unsigned and
   32 bits/64 bits should be supported.

I noticed today that there are some cases where a CTLTYPE_INT is being
fed a uint32_t, for example in sys/netinet6/ip6_input.c this is the
case for ip6_temp_preferred_lifetime and similar values that are
uint32_t.

It seems to make sense to add a CTLTYPE_UINT for these types, although
there are other options. FreeBSD introduced them way back. We could
continue to ignore the signedness differences though...

Thoughts?

Justin