[Merge] lp:~xnox/system-service/python3 into lp:system-service

[Martin Pitt]

Review: Needs Fixing

I tested this with trying to set a proxy in control-center's Network tab, and applying system-wide. This stopped working with this branch.

$ sudo /usr/lib/system-service/system-service-d
Traceback (most recent call last):
  File "/usr/lib/system-service/system-service-d", line 22, in <module>
    from UbuntuSystemService.backend import ServiceBackend
ImportError: No module named UbuntuSystemService.backend

Seems you forgot to update the shebangs?
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https://code.launchpad.net/~xnox/system-service/python3/+merge/192805
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