Fix format string errors in log messages and update ldapd to use relayd's log.c

OK benno@ jmatthew@

From a syslog perspective it does not make sense to log fatal and
warn with the same severity. Switch log_warn() to LOG_ERR and keep
fatal() at LOG_CRIT.
OK reyk@ florian@

unbreak tree

work on making log.c similar in all daemons:

move daemon-local functions into new logmsg.c, and reduce
the (mostly whitespace) differences so that log.c's can be diffed easily.

ok krw@ jmatthew@

Nuke some whitespace that keeps poking me in the eye as I try to
steal code.

bunch of format string cleanups, removing %i, signed vs unsigned, and even
a few long long's
ok jmatthew

Make -dvv flags produce debug traces of decoded BER messages on stderr.
Also shows a hexdump of the input buffer if BER decoding fails.
Useful when debugging protocol issues.

Prefix debug logging on stderr with time and pid, like syslog.

Initial import of ldapd, a small LDAP daemon. Work in progress.

ok deraadt@ jacekm@ gilles@ back@ henning@ blambert@