When ACI modules are being used for querying MOs, we should not return
the previous state, as there is no previous state, there's only the
current state.
This impacts a lot of tests that were used to testing the current state
as 'previous'.
* ACI: Change result output as discussed
* Update all modules to use new aci.exit_json()
* Update output_level spec and docs
* Fix integration tests
* Small PEP8 fix
* Asorted fixes to tests and aci_rest
* More test fixes and support for ANSIBLE_DEBUG
* Fix another PEP8 issues
* Move response handling inside ACI module
* Reform of ACI error handling and error output
* Diff multiline json output
* Fix a few more tests
* Revert aci_bd tests
* Small correction
* UI change: existing->current, original->previous
* UI change: config->sent
* Update all modules with RETURN values
* Fix a few more tests
* Improve docstring and add 'raw' return value
* Fix thinko
* Fix sanity/pep8 issues
* Rewrite unit tests to comply with new design
