when sending a non retry update fails, log it at warn level

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1554110 13f79535-47bb-0310-9956-ffa450edef68
tests: raise timeouts for nightly runs

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1554114 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5587: ElectionContext implementations should use ZkCmdExecutor#ensureExists to ensure their election paths are properly created.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1554115 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4709: Move CHANGES to 4.6.1

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1554120 13f79535-47bb-0310-9956-ffa450edef68