[Python] Create thread, and receive signal to handle reload, shutdown

小試了一下怎樣用Python開一隻thread, 然後讓它收signal 做reload跟 shutdown
https://github.com/jofenting/memo/blob/master/testSig.py
跑起來

python testSig.py

用另一個console送signal給他
reload

kill -1 <pid>

shutdown

kill -15 <pid>

收工