SOLR-5652: Make test more deterministicly random, and increase logging to try and track down strange test failure

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1560219 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5650: When a replica becomes a leader, only peer sync with other replicas that last published an ACTIVE state.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1560221 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5099 - QueryNode should have the ability to detach from its node parent

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1560245 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5411: Upgrade to released JFlex 1.5.0; stop requiring a locally built JFlex snapshot jar.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1560260 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5476 hardened a bit

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1560279 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5476 ignored till there is a reliable way to restart Overseer

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1560314 13f79535-47bb-0310-9956-ffa450edef68