STORM-70 Upgrade to ZK-3.4.5 and curator-1.3.3
remove Yahoo copyright from NOTICE files
NOTICE revised regarding Yahoo contribution
Work around ZOOKEEPER-1476 by prefering IPv4 by default.
Merge pull request #1 from apache/master

merge from apache/incubator-storm
Merge branch 'storm-70-zk-upgrade' of github.com:revans2/incubator-storm
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-storm
Merge branch 'master' of github.com:anfeng/incubator-storm