reset device may trigger hotplug thread and the process will be killed

[AristoChen]

Based on the discussion, we may need to implement a mechanism to prevent the hotplug thread kill the process if the Host send reset request

These might not be the best solution, but what I have in my mind now are

1. Stop the hotplug thread before reset, and try to restart the hotplug thread after reset
2. Add a flag like this commit to let user decide whether the hotplug thread should be created or not, which will be default yes.