DevMgr:attachAllUnattachedDevicesFromKnownListReq: acquire qutex

We should acquire the qutex here before iterating through the list
of DA specs.

smocore/include/deviceManager/deviceManager.h

@@ -111,6 +111,7 @@ private:
 	class AttachSenseDeviceReq;
 	typedef AttachSenseDeviceReq DetachSenseDeviceReq;
 	class AttachAllUnattachedDevicesFromReq;
+	class AttachAllUnattachedDevicesFromKnownListReq;
 	class DetachAllAttachedDeviceRoles;
 };