Removed redundant newlines that were in some panic strings.

Added missing newlines to calls to log().

After dynamically reducing rtq_reallyold, have in_rtqkill() reduce the
expiration timer of anything which would expire later than that. (There
should be a way to call this from ip_sysctl() as well,

After dynamically reducing rtq_reallyold, have in_rtqkill() reduce the
expiration timer of anything which would expire later than that. (There
should be a way to call this from ip_sysctl() as well, but there currently
isn't.)

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Attempt to make the host route cache a bit smarter under conditions of
high load:

1) If there ever get to be more than net.inet.ip.rtmaxcache entries
in the cache, in_rtqtimo() will reduce net.

Attempt to make the host route cache a bit smarter under conditions of
high load:

1) If there ever get to be more than net.inet.ip.rtmaxcache entries
in the cache, in_rtqtimo() will reduce net.inet.ip.rtexpire by
1/3 and do another round, unles net.inet.ip.rtexpire is less than
net.inet.ip.rtminexpire, and never more than once in ten minutes
(rtq_timeout).

2) If net.inet.ip.rtexpire is set to zero, don't bother to cache
anything.

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Change caching strategy somewhat:
1) Don't clone routes to multicast destinations; there is nothing useful
to be gained in this case.
2) Reduce default expiration timer to one hour. Busy sites wi

Change caching strategy somewhat:
1) Don't clone routes to multicast destinations; there is nothing useful
to be gained in this case.
2) Reduce default expiration timer to one hour. Busy sites will still
likely want to reduce this, but for ordinary users this is a reasonable
value to use.

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Avoid a serious race by blocking netisrs while walking the route tree.
(IWBRNI we could just block IP netisrs...)

Update calls to rtalloc1(). Also merge rt_prflags with rt_flags.

Delete old, confusing comment.

Add a check to make sure that we don't fiddle with the NFS routing tables
as well (bleah!). Also, increase the interval to the real-life value and
eliminate debugging printfs. This will be standard

Add a check to make sure that we don't fiddle with the NFS routing tables
as well (bleah!). Also, increase the interval to the real-life value and
eliminate debugging printfs. This will be standard once tested by others.

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Add latest version of ``advanced route metric management'' :-)
As before, this is currently conditionalized on options IN_RMX until
I'm sure it's working.

Completely replace JTW's idea with my (incompletely implemented) original
idea. This is les likely to crash your machine. As before, this code is only
enabled under `options IN_RMX'.

This is the file that actually implements the smarter behavior.