related JIRA: [SPARK-9212](https://issues.apache.org/jira/browse/SPARK-9212) and [SPARK-8101](https://issues.apache.org/jira/browse/SPARK-8101)

Author: Zhang, Liye <liye.zhang@intel.com>

Closes #7562 from liyezhang556520/SPARK-9212 and squashes the following commits:

1917729 [Zhang, Liye] SPARK-9212 upgrade Netty version to 4.0.29.Final