Make YARN auto-tuning for nodemanager available memory, VCPU's
Make YARN scheduler an attribute to allow easy choosing between fair-scheduler or capacity-scheduler
Ensure ulimits are respected for hdfs, hbase, mapreduce and yarn
Ensure kafka has a reasonable open file ulimit
Stop being draconian with IPv6 and simply tell Java to prefer IPv4 where needed
Move to tracking upstream sysctl cookbook again
Merge pull request #328 from cbaenziger/configuration_cleanups

Configuration Cleanups
Changes to seperate YARN NM and DN restart code, use attributes for DN port values
Merge branch 'hadoop_hortonworks' of https://github.com/bloomberg/chef-bcpc into dn_rolling_restart