change assume to SuppressCodecs for more test iterations over time

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1538556 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5324: AnalyzerWrapper.get(PositionIncrement|Offset)Gap can now be overridden.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1538557 13f79535-47bb-0310-9956-ffa450edef68