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

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

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

Approved by: re (implicit)

Fixed assorted misuses of NULL in integer context.

sysinstall's primitive network configuration expects only one value
for each option in the DHCP lease file. The DHCP lease parsing code
specifically ignores more than the first nameserver, but it didn't
previously deal with the case of more than one router. This caused
segfaults and a painful death when installing on a network with
multiple routers.

PR: misc/16003

$Id$ -> $FreeBSD$

Fix a bad dhcp keyword; it's host-name not server-name.

Another batch of fixes for dhcp support in sysinstall, now dragging
in some code from C. Stone to parse the lease information. This is still
a WIP and this commit is largely intended to allow others to sync up; the
dhclient code still only works when doing dhcp configuration post-install
and requires a bit more work on the boot floppy before it will truly
work in the minimal bootstrapping role.