Handle Graceful App Shutdown

[tobru]

Better compliance with Kubernetes.

https://stackoverflow.com/questions/18499497/how-to-process-sigterm-signal-gracefully/31464349#31464349

[tobru]

5aae306

2021-02-27 14:05:29,586 - pylokid - INFO - Starting pylokid version 3.0.3
2021-02-27 14:05:29,587 - pylokid.library.emailhandling - INFO - Connecting to IMAP server hosted.mailcow.de
2021-02-27 14:05:29,674 - pylokid.library.emailhandling - INFO - IMAP connection successful
2021-02-27 14:05:29,674 - pylokid.library.lodur - INFO - Connecting to Lodur
2021-02-27 14:05:33,510 - pylokid.library.lodur - INFO - Login to Lodur succeeded
2021-02-27 14:05:33,511 - pylokid.library.webdav - INFO - Connecting to WebDAV server https://files.feuerwehrurdorf.ch/remote.php/webdav/
2021-02-27 14:05:33,512 - pylokid.library.webdav - INFO - WebDAV connection successfull
2021-02-27 14:05:33,512 - pylokid.library.pdftotext - INFO - PDF parsing based on pdftotext loaded
2021-02-27 14:05:33,512 - pylokid.library.emailhandling - INFO - Searching for messages matching: (OR OR SUBJECT "Einsatzausdruck_FW" SUBJECT "Einsatzprotokoll" SUBJECT "Einsatzrapport" UNSEEN)
2021-02-27 14:05:33,522 - pylokid.library.emailhandling - INFO - Found 0 matching messages
2021-02-27 14:05:33,574 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:06:03,591 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:06:33,622 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:07:03,654 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:07:33,681 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:08:03,710 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:08:33,739 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:09:03,769 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:09:33,799 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:10:03,823 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:10:33,848 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:11:03,879 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:11:33,902 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:12:03,932 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:12:33,965 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:13:03,995 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:13:34,022 - pylokid - INFO - Waiting 30 seconds until next check
2021-02-27 14:13:40,716 - pylokid - INFO - Received signal SIGTERM
2021-02-27 14:14:04,038 - pylokid - INFO - Pylokid waves bye bye