syslog_daemon: Converted to BServer.

* Instead of letting the kernel search for the syslog port, the
  daemon now registers itself with the kernel (which even solves
  a TODO).
* A port is created for the actual log messages from the launch_daemon,
  and used on start.
* However, the SyslogTest does not yet work, due to the BMessage <->
  KMessage communication problems.

headers/private/system/syscalls.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2004-2011, Haiku, Inc. All rights reserved.
+ * Copyright 2004-2015, Haiku, Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _SYSTEM_SYSCALLS_H
@@ -472,6 +472,7 @@ extern status_t		_kern_get_port_message_info_etc(port_id port,
 
 // debug support functions
 extern status_t		_kern_kernel_debugger(const char *message);
+extern void			_kern_register_syslog_daemon(port_id port);
 extern void			_kern_debugger(const char *message);
 extern int			_kern_disable_debugger(int state);