Add Masquerade manager event which trips when a masquerade happens (issue #7840 reported by moy)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@44273 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -25,3 +25,5 @@ Changes since Asterisk 1.4-beta was branched:
      CallerIDNum is used for number and CallerIDName for name.
   * setinterfacevar option in queues.conf also now sets a variable
      called MEMBERNAME which contains the member's name.
+  * Added Masquerade manager event for when a masquerade happens between
+    two channels.

main/channel.c

@@ -3215,6 +3215,9 @@ int ast_do_masquerade(struct ast_channel *original)
 		ast_log(LOG_DEBUG, "Actually Masquerading %s(%d) into the structure of %s(%d)\n",
 			clone->name, clone->_state, original->name, original->_state);
 
+	manager_event(EVENT_FLAG_CALL, "Masquerade", "Clone: %s\r\nCloneState: %s\r\nOriginal: %s\r\nOriginalState: %s\r\n",
+		      clone->name, ast_state2str(clone->_state), original->name, ast_state2str(original->_state));
+
 	/* XXX This is a seriously wacked out operation.  We're essentially putting the guts of
 	   the clone channel into the original channel.  Start by killing off the original
 	   channel's backend.   I'm not sure we're going to keep this function, because