Reduce log level

In certain configurations reading xattrs may be denied by filesystem
permissions which may result in a large amount of error messages of
the form

   sys_getextattr_size: error: Permission denied

being logged.
afpd: Zeroconf: do not register ASP/DDP instance

The problem is that when both DDP and TCP are enabled, afpd tries to register
twice on avahi (once for TCP, and once for ASP), with the same service name.

Skip Avahi registration for ASP/DDP configuration, to avoid the double
registration.

Authored-by: Vincent Duvert <vdd@duvert.net>
Reviewed-by: Ralph Boehme <rb@sernet.de>
libatalk: asp: set parent_or_child after fork()

The ASP session manager forks when a new session is created but does
not set the parent_or_child variable, so load_volumes will not load
the user-specific volumes nor AppleVolumes.default on ASP.

Set parent_or_child = 1 after this fork(), so clients which use
ASP/DDP will get the correct user-specific volumes.

Authored-by: Vincent Duvert <vdd@duvert.net>
Reviewed-by: Ralph Boehme <rb@sernet.de>