Consider all features enabled by Liberty configuration files for diagnostic checks

[cherylking]

Follow on to issue #67. The diagnostic code for config elements that do not have a feature configured only takes into account the features listed in the current xml file. If other xml files are included via the <include> element, or by placing them in the configDropins folder, any features listed in those xml files are not considered in the diagnostic check.

[cherylking]

This also means that config snippets in configDropins will show diagnostics even though the feature is configured in the xml file that includes it.

[cherylking]

Good reference doc for Liberty config and include file processing.

[cherylking]

Decided to put this one on pause until we get customer feedback.