[SPARK-4253] Ignore spark.driver.host in yarn-cluster and standalone-cluster modes

In yarn-cluster and standalone-cluster modes, we don't know where driver will run until it is launched.  If the `spark.driver.host` property is set on the submitting machine and propagated to the driver through SparkConf then this will lead to errors when the driver launches.

This patch fixes this issue by dropping the `spark.driver.host` property in SparkSubmit when running in a cluster deploy mode.

Author: WangTaoTheTonic <barneystinson@aliyun.com>
Author: WangTao <barneystinson@aliyun.com>

Closes #3112 from WangTaoTheTonic/SPARK4253 and squashes the following commits:

ed1a25c [WangTaoTheTonic] revert unrelated formatting issue
02c4e49 [WangTao] add comment
32a3f3f [WangTaoTheTonic] ingore it in SparkSubmit instead of SparkContext
667cf24 [WangTaoTheTonic] document fix
ff8d5f7 [WangTaoTheTonic] also ignore it in standalone cluster mode
2286e6b [WangTao] ignore spark.driver.host in yarn-cluster mode

core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala

@@ -281,6 +281,11 @@ object SparkSubmit {
       sysProps.getOrElseUpdate(k, v)
     }
 
+    // Ignore invalid spark.driver.host in cluster modes.
+    if (deployMode == CLUSTER) {
+      sysProps -= ("spark.driver.host")
+    }
+
     // Resolve paths in certain spark properties
     val pathConfigs = Seq(
       "spark.jars",

yarn/common/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMasterArguments.scala

@@ -36,7 +36,7 @@ class ApplicationMasterArguments(val args: Array[String]) {
 
     var args = inputArgs
 
-    while (! args.isEmpty) {
+    while (!args.isEmpty) {
       // --num-workers, --worker-memory, and --worker-cores are deprecated since 1.0,
       // the properties with executor in their names are preferred.
       args match {