add infrastructure for ratelimited logging; feedback/ok dtucker

retire unused API

do not pass file/func to monitor; noted by Ilja van Sprundel; ok djm@

include "ssherr.h" not <ssherr.h>; from Balu Gajjala via bz#3292

whitespace (tab after space)

make program name be const

variants of the log methods that append a ssherr.h string from
a supplied error code; ok markus@

remove a level of macro indirection; ok markus@

add some variant log.h calls that prepend the calling function
name; ok markus@

make the log functions that exit (sshlogdie(), sshfatal(), etc) have
identical signatures. Makes things a bit more consistent...

revised log infrastructure for OpenSSH

log functions receive function, filename and line number of caller.
We can use this to selectively enable logging via pattern-lists.

ok markus@

lots of things were relying on libcrypto headers to transitively
include various system headers (mostly stdlib.h); include them
explicitly

avoid expensive channel_open_message() calls; ok djm@

allow LogLevel in sshd_config Match blocks; ok dtucker bz#2717

Reduce the syslog level of some relatively common protocol events
from LOG_CRIT by replacing fatal() calls with logdie(). Part of
bz#2585, ok djm@

Add -E option to ssh and sshd to append debugging logs to a specified file
instead of stderr or syslog. ok markus@, man page help jmc@

Add ~v and ~V escape sequences to raise and lower the logging level
respectively. Man page help from jmc, ok deraadt jmc

make the pre-auth privsep slave log via a socketpair shared with the
monitor rather than /var/empty/dev/log; ok dtucker@ deraadt@ markus@

replace __dead with __attribute__((noreturn)), makes things a little easier
to port. Also, add it to sigdie(). ok djm@

Add extended test mode (-T) and connection parameters for test mode (-C).
-T causes sshd to write its effective configuration to stdout and exit.
-C causes any relevant Match rules to be applied befo

Add extended test mode (-T) and connection parameters for test mode (-C).
-T causes sshd to write its effective configuration to stdout and exit.
-C causes any relevant Match rules to be applied before output. The
combination allows tesing of the parser and config files. ok deraadt djm

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make signal handler termination path shorter; risky code pointed out by
mark dowd; ok djm markus

almost entirely get rid of the culture of ".h files that include .h files"
ok djm, sort of ok stevesk
makes the pain stop in one easy step

move #include <stdarg.h> out of includes.h; ok markus@

standardise spacing in $OpenBSD$ tags; requested by deraadt@

mark fatal and cleanup exit as __dead; ok markus@