add spark version to driver log

Author: liyezhang556520

core/src/main/scala/org/apache/spark/SparkConf.scala

@@ -240,6 +240,8 @@ class SparkConf(loadDefaults: Boolean) extends Cloneable with Logging {
   /** Checks for illegal or deprecated config settings. Throws an exception for the former. Not
     * idempotent - may mutate this conf object to convert deprecated settings to supported ones. */
   private[spark] def validateSettings() {
+    logInfo(s"Spark Version: ${SPARK_VERSION}")
+    
     if (settings.contains("spark.local.dir")) {
       val msg = "In Spark 1.0 and later spark.local.dir will be overridden by the value set by " +
         "the cluster manager (via SPARK_LOCAL_DIRS in mesos/standalone and LOCAL_DIRS in YARN)."