DevReattacher: Add 20ms sync delay during stop()

This fixes the bug where in-flight async ops that were triggered
by DevReattacher (such as livoxGen1_attachDeviceReq) that have
unconditional delays in them would fire late, after the state
var they rely upon had already been de-initialized.

We use an async bridge to ensure that those ops get executed in
the background and then resume execution after the delay.

smocore/deviceManager/deviceReattacher.cpp

@@ -3,6 +3,7 @@
 #include <functional>
 #include <componentThread.h>
 #include <callback.h>
+#include <asynchronousBridge.h>
 #include <deviceManager/deviceReattacher.h>
 #include <deviceManager/deviceManager.h>
 
@@ -35,6 +36,24 @@ void DeviceReattacher::stop()
 {
 	shouldContinue.store(false);
 	timer.cancel();
+
+	// Set up a timeout bridge using Marionette thread's io_service
+	auto& mrnttIoService = ComponentThread::getMrntt()->getIoService();
+	boost::asio::deadline_timer timeoutTimer(mrnttIoService);
+	AsynchronousBridge bridge(mrnttIoService);
+
+	// Set up the timeout for ~10ms
+	timeoutTimer.expires_from_now(boost::posix_time::milliseconds(20));
+	timeoutTimer.async_wait(
+		[&bridge](const boost::system::error_code& error)
+		{
+			(void)error;
+
+			// Always signal complete, whether timeout expired or was cancelled
+			bridge.setAsyncOperationComplete();
+		});
+
+	bridge.waitForAsyncOperationCompleteOrIoServiceStopped();
 }
 
 void DeviceReattacher::scheduleNextTimeout()