In LLPluginProcessParent, instead of killing the plugin process, terminate it...

In LLPluginProcessParent, instead of killing the plugin process, terminate it by closing the sockets.  This lets it do some cleanup before exiting, instead of just getting shot.

indra/llplugin/llpluginprocessparent.cpp

@@ -79,8 +79,10 @@ LLPluginProcessParent::~LLPluginProcessParent()
 		// and remove it from our map
 		mSharedMemoryRegions.erase(iter);
 	}
-
-	mProcess.kill();
+	
+	// orphaning the process means it won't be killed when the LLProcessLauncher is destructed.
+	// This is what we want -- it should exit cleanly once it notices the sockets have been closed.
+	mProcess.orphan();
 	killSockets();
 }
 
@@ -414,7 +416,8 @@ void LLPluginProcessParent::idle(void)
 			break;
 			
 			case STATE_CLEANUP:
-				mProcess.kill();
+				// Don't do a kill here anymore -- closing the sockets is the new 'kill'.
+				mProcess.orphan();
 				killSockets();
 				setState(STATE_DONE);
 			break;