bitbake: monitordisk: fire event DISKFULL when terminate build

Part of [Yocto #2168]

Add a event DiskFull to descript the termination by disk monitor.

Update check() to fire the event DiskFull when terminates the build.
This could help UIs to deal this scenario and show more information to
end user.

(Bitbake rev: 0a0fca3d94a1db6458ae21501a66461a334410ed)

Signed-off-by: Kang Kai <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/event.py

@@ -312,6 +312,14 @@ class BuildCompleted(BuildBase, OperationCompleted):
             OperationCompleted.__init__(self, total, "Building Failed")
         BuildBase.__init__(self, n, p, failures)
 
+class DiskFull(Event):
+    """Disk full case build aborted"""
+    def __init__(self, dev, type, freespace, mountpoint):
+        Event.__init__(self)
+        self._dev = dev
+        self._type = type
+        self._free = freespace
+        self._mountpoint = mountpoint
 
 class NoProvider(Event):
     """No Provider for an Event"""