* 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
* find_comments implementation and AugeasCommentNode creation
* Use dummy value for ancestor
* Add NotImplementedError when calling find_comments with exact parameter
* Remove parameter 'exact' from find_comments interface
* Fix comment
* DualParserNode, DualCommentNode and DualDirectiveNode implementations
* Add DualBlockNode
* Address review comments
* Address review comments
* Call the right assertion after name change
* Simplify isPass
* Add explanation to _create_matching_list pydoc
* Break when match was found
