LUCENE-4874: Don't override non abstract methods that have an impl through
other abstract methods in FilterAtomicReader and related classes (merged from
r1464710 and r1464768).


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1464776 13f79535-47bb-0310-9956-ffa450edef68