[Merge] lp:~davidmhewitt/system-service/fix-1740596 into lp:system-service

[David Hewitt]

David Hewitt has proposed merging lp:~davidmhewitt/system-service/fix-1740596 into lp:system-service.

Commit message:
Use _clear_etc_environment_no_proxy instead of _clear_no_proxy

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1740596 in ubuntu-system-service (Ubuntu): "set_no_proxy method fails when trying to clear with """
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-system-service/+bug/1740596

For more details, see:
https://code.launchpad.net/~davidmhewitt/system-service/fix-1740596/+merge/335605

A non-existent method was being used in the set_no_proxy method when trying to clear the config. This change corrects this and uses the existing method.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~davidmhewitt/system-service/fix-1740596 into lp:system-service.
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