Fix: checkbox crash for non-existent usernames and refactor user handling #451
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Description
This patch fixes a problem where checkbox would crash when controller provided a username that doesn't exists on the controlled system. It also moves the user handling heuristics into a new module and simplifies the existing logic.
See bug on JIRA and unit tests from this patch for details.
Resolved issues
Fixes: CHECKBOX-597
Documentation
The functionality doesn't change so no docs.
Tests
In this patch I provide unit tests for the heuristics.
Moreover the following PR will have a metabox test that will test this as well.
Testing
I tested the branch using a remote/service combo with launchers specifying random combination of existing and non-existent users.
And of course tox + metabox.