* Fix metadata & primary references in Augeas tests.
When performing actions only on one of the trees in DualNodeParser, the two
trees get out-of-sync. Similarly, we can't expect that the metadata between
the two trees will remain the same.
Did a pass over the tests to re-wire metadata and primary usage.
* Add ApacheParser skeleton.
Fix plumbing in configurator & dualparser to initialize ApacheParser
alongside AugeasParser.
* Silence coverage reports for now
