[EAGLE-1024] Monitor jobs with high RPC throughput

https://issues.apache.org/jira/browse/EAGLE-1024

* add job RPC data in MAP_REDUCE_JOB_STREAM
* refactor org.apache.eagle.jpm.analyzer.publisher.EmailPublisher
* support new config 'application.analyzerReport.alertLevel' to define alert level

Author: Zhao, Qingwen <qingwzhao@apache.org>

Closes #938 from qingwen220/EAGLE-1024.
27 files changed