mount_server: restore automount notification.

Fix #14149.

mount_server: Use scoring mechanism to detect volume

* This makes mounting volumes more stable; ie. you can put your
drive in another slot, or boot your native system in emulation, and
it will still find the drives to mount.
* The old method is still left there in order to achieve a smooth
transition.

mount_server: Ported to a launch_daemon world.

* Now inherits from BServer, and gets its message port from the
launch_daemon.
* It registers an event "initial_volumes_mounted" that allows other
services to be started afterwards.
* This is now used in the boot launch files, and makes the scripting
based previous solution superfluous which has been removed with this
commit, too.
* This implements the last needed feature in order to reproduce the
complete former boot process using the launch_daemon.

Work in progress of moving the (audo-)mounting functionality from Tracker into
a dedicated mount server. This is pretty much a straight copy from the
AutoMounter code from Tracker, except
* the eject on unmount setting has been added (in Tracker, it's part of the
general settings, not the mount specific ones),
* scripting features have been added, such that it becomes possible to trigger
mounting the previoulsy mounted volumes from the outside, and most
importantly block until the operation is done (waiting for the reply).

TODO:
* Change Tracker to not run it's own AutoMounter, but send messages to the
new server.
* Move the eject when unmounting setting to the mount settings window.
* Enable the mount_server in the Bootscript.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33484 a95241bf-73f2-0310-859d-f6bbb57e9c96

mount_server: Ported to a launch_daemon world.

* Now inherits from BServer, and gets its message port from the
launch_daemon.
* It registers an event "initial_volumes_mounted" that allows other
services to be started afterwards.
* This is now used in the boot launch files, and makes the scripting
based previous solution superfluous which has been removed with this
commit, too.
* This implements the last needed feature in order to reproduce the
complete former boot process using the launch_daemon.

Work in progress of moving the (audo-)mounting functionality from Tracker into
a dedicated mount server. This is pretty much a straight copy from the
AutoMounter code from Tracker, except
* the eject on unmount setting has been added (in Tracker, it's part of the
general settings, not the mount specific ones),
* scripting features have been added, such that it becomes possible to trigger
mounting the previoulsy mounted volumes from the outside, and most
importantly block until the operation is done (waiting for the reply).

TODO:
* Change Tracker to not run it's own AutoMounter, but send messages to the
new server.
* Move the eject when unmounting setting to the mount settings window.
* Enable the mount_server in the Bootscript.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33484 a95241bf-73f2-0310-859d-f6bbb57e9c96