LUCENE-5798: Optimize MultiDocsEnum reuse

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1607049 13f79535-47bb-0310-9956-ffa450edef68
Sonatype OSS repo is returning 301 (permanently moved) for http URLs, which aren't followed by Maven Ant Tasks (artifact:dependencies), and cause the build to fail. Switching the base Sonatype OSS repo to https to see if that fixes the problem.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1607053 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5786: Unflushed/ truncated events file (hung testing subprocess). Updating RR to 2.1.6

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1607058 13f79535-47bb-0310-9956-ffa450edef68