Author: shekhar.bansal <shekhar.bansal@guavus.com>

Closes #5719 from zuxqoj/master and squashes the following commits:

5574ff7 [shekhar.bansal] [SPARK-6653][yarn] New config to specify port for sparkYarnAM actor system
5117258 [shekhar.bansal] [SPARK-6653][yarn] New config to specify port for sparkYarnAM actor system
9de5330 [shekhar.bansal] [SPARK-6653][yarn] New config to specify port for sparkYarnAM actor system
456a592 [shekhar.bansal] [SPARK-6653][yarn] New configuration property to specify port for sparkYarnAM actor system
803e93e [shekhar.bansal] [SPARK-6653][yarn] New configuration property to specify port for sparkYarnAM actor system