Don't log failed lstat
Decrease loglevel to debug from error
Option "vol dbnest"

When set to true, the CNID database for a volume is stored in the volume root
of a share in a directory .AppleDB like in Netatalk 2. Defaults to false.

From FR#84.
Small fix in the DSI tickle handling

Due to a regression introduced in 9355ebcc5744bbd445a0c8cb8b0a0ca201d5499a
the server may send an extra DSI tickle immediately after a "volume modified"
DSI attention notification. This will only happen if the connection is

o completely idle, and
o the volume was modified by another AFP client

The result is an extra DSI tickle every 30 seconds.

Fixes bug #528.
Enhance handling of connection attempts when hitting the connection limit

Bug #529.
Fix off-by-one connection limit check
Fix variadic macro syntax
Fix error in ad_openat(), bug #532

Saving from Word to a folder that is a symlink to a folder on another filesystem
results in a crash of the afpd process and the save to fail. This happens only
if the option "follow symlinks" is enabled.
Remove debug log statements
Add warning about folllow symlinks and crossing filesystems
Disable Kerberos UAM if AFP service principal name can't be evaluated

Fixes bug #531.
Merge remote-tracking branch 'origin/branch-netatalk-3-0' into develop