event.py: Add new events RequestPackageInfo and PackageInfo

RequestPackageInfo is triggered by GUI client to request the available
package information.

PackageInfo event is to pass package information back to GUI.

(Bitbake rev: 9020c2d4476766f63ff7e024bbd99043d06feefc)

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/event.py

@@ -467,3 +467,16 @@ class LogHandler(logging.Handler):
     def filter(self, record):
         record.taskpid = worker_pid
         return True
+
+class RequestPackageInfo(Event):
+    """
+    Event to request package information
+    """
+
+class PackageInfo(Event):
+    """
+    Package information for GUI
+    """
+    def __init__(self, pkginfolist):
+        Event.__init__(self)
+        self._pkginfolist = pkginfolist