LUCENE-5961: Fix test bug in TestValueSources.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1633073 13f79535-47bb-0310-9956-ffa450edef68
Revert changes to SparseFixedBitSet.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1633076 13f79535-47bb-0310-9956-ffa450edef68