carp: Perfer addresses with prefix route installed.
carp: Take netmask into consideration when picking up backing address
carp: Fix routes reset issue

Before this commit, routes related to carp or carp backing device were
reset, i.e. only prefix route was left, when carp state changed, e.g.
carp is down.

This commit fixes this routes reset issue by replacing the carp or carp
device routes' rt_ifa and rt_ifp with proper ifaddr and ifnet, instead
of discarding the old routes and installing the new prefix route.

Reported-by: robgar
Point to more neutral, yet dports biased directories from manual pages.

Most of them are identical in pkgsrc.
Switch to /usr/local/... paths in several files.
kernel/kern_time.c: Mark the hack to not settimeofday(0) with XXX.
evtranalyze(1): Move it to using ploticus from dports.
bce: Update man page
bnx: Add comment about how the RSS redirect table is configured
vmstat: Update man page for the -v
bce.4: Fix wording and typos in a number of places.
em/emx: Unbreak vlan settings

Obtained-from: FreeBSD