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Merge pull request #3332 from s0undt3ch/develop

Some more external sub-classing and code re-use support
Merge pull request #3333 from s0undt3ch/develop

Allow providing the defaults dictionary to override.
Merge branch 'develop' of github.com:saltstack/salt into develop
Fix `tests.unit.pydsl_test` and `tests.unit.stateconf_test`.

No more errors are shown because the configuration files are not readable, and in fact, the minion configuration can be use, unlike what was said in the comment.