[EC2] increase ip_conntrack_max; disable datanode write timeout
[EC2] increase ip_conntrack_max; disable datanode write timeout

git-svn-id: 25ca64b629f24bdef6d1cceac138f74b13f55e41@938982 13f79535-47bb-0310-9956-ffa450edef68

francisliu/hbase_namespace,StumbleUponArchive/hbase,jyates/hbase,Shmuma/hbase-trunk,bcopeland/hbase-thrift,matteobertozzi/hbase,matteobertozzi/hbase,cloudera/hbase,bcopeland/hbase-thrift,cloudera/hbase,Shmuma/hbase-trunk,matteobertozzi/hbase,matteobertozzi/hbase,matteobertozzi/hbase,francisliu/hbase_namespace,bcopeland/hbase-thrift,centiteo/hbase,ryanobjc/hbase,francisliu/hbase_namespace,lichongxin/hbase-snapshot,matteobertozzi/hbase,matteobertozzi/hbase,francisliu/hbase_namespace,StumbleUponArchive/hbase,jyates/hbase,optimizely/hbase,jyates/hbase,francisliu/hbase_namespace,francisliu/hbase_namespace,jyates/hbase,bcopeland/hbase-thrift,cloudera/hbase,optimizely/hbase,jyates/hbase,bcopeland/hbase-thrift,lichongxin/hbase-snapshot,Shmuma/hbase-trunk,jyates/hbase,lichongxin/hbase-snapshot,optimizely/hbase,jyates/hbase,bcopeland/hbase-thrift,lichongxin/hbase-snapshot,Shmuma/hbase-trunk,ryanobjc/hbase,francisliu/hbase_namespace,ryanobjc/hbase,cloudera/hbase,Shmuma/hbase-trunk,Shmuma/hbase-trunk,ryanobjc/hbase,francisliu/hbase_namespace,centiteo/hbase,Shmuma/hbase-trunk,optimizely/hbase,StumbleUponArchive/hbase,ryanobjc/hbase,centiteo/hbase,StumbleUponArchive/hbase,matteobertozzi/hbase,ryanobjc/hbase,optimizely/hbase,matteobertozzi/hbase,StumbleUponArchive/hbase,cloudera/hbase,StumbleUponArchive/hbase,cloudera/hbase,bcopeland/hbase-thrift,optimizely/hbase,centiteo/hbase,jyates/hbase,lichongxin/hbase-snapshot,francisliu/hbase_namespace,StumbleUponArchive/hbase,jyates/hbase,centiteo/hbase,centiteo/hbase,lichongxin/hbase-snapshot,centiteo/hbase