Make compatible with Ombi Automatic Updater

[tidusjar]

We have the option in ombi to specify a custom script to update ombi. See wiki entry here: https://github.com/tidusjar/Ombi/wiki/Update-Settings

This script would get executed everytime ombi detects there is a new update.

[kyse]

Was messing around with this and ran into a couple problems with that thought.

The update script gets run under the Ombi.service in sytemd so when the update script wants to stop the service, the update script gets killed as well.

Will play around some more with it, to get a working solution and submit a PR if I have time.

Edited by Unimatrix0: Removed comments unrelated to this issue.

[didyouexpectthat]

I notice Ombi shows which package to use and sets all these variables but update_ombi doesn't use the same flags.

Feb 09 09:23:57 plexrequests Ombi[16811]: Starting /opt/update_ombi/update_ombi.sh https://ci.appveyor.com/api/buildjobs/284p86h9n64cakim/artifacts/linux.tar.gz --applicationPath "/opt/ombi" --processname "Ombi" --startupArgs http://*:5001
Feb 09 09:23:57 plexrequests Ombi[16811]: dbug: Ombi.Schedule.Jobs.Ombi.OmbiAutomaticUpdater[6000]
Feb 09 09:23:57 plexrequests Ombi[16811]: Script started
Feb 09 09:23:57 plexrequests  Ombi[16811]: dbug: Ombi.Helpers.ProcessProvider[0]
Feb 09 09:23:57 plexrequests  Ombi[16811]: ****************************
Feb 09 09:23:57 plexrequests  Ombi[16811]: dbug: Ombi.Helpers.ProcessProvider[0]
Feb 09 09:23:57 plexrequests  Ombi[16811]: * Error: Invalid argument. *
Feb 09 09:23:57 plexrequests  Ombi[16811]: dbug: Ombi.Helpers.ProcessProvider[0]
Feb 09 09:23:57 plexrequests  Ombi[16811]: ****************************