[SPARK-17339][CORE][BRANCH-2.0] Do not use path to get a filesystem i…

…n hadoopFile and newHadoopFile APIs

## What changes were proposed in this pull request?

This PR backports apache#14960

## How was this patch tested?

AppVeyor - https://ci.appveyor.com/project/HyukjinKwon/spark/build/86-backport-SPARK-17339-r

Author: hyukjinkwon <[email protected]>

Closes apache#15008 from HyukjinKwon/backport-SPARK-17339.

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

@@ -988,7 +988,7 @@ class SparkContext(config: SparkConf) extends Logging with ExecutorAllocationCli
 
     // This is a hack to enforce loading hdfs-site.xml.
     // See SPARK-11227 for details.
-    FileSystem.get(new URI(path), hadoopConfiguration)
+    FileSystem.getLocal(hadoopConfiguration)
 
     // A Hadoop configuration can be about 10 KB, which is pretty big, so broadcast it.
     val confBroadcast = broadcast(new SerializableConfiguration(hadoopConfiguration))
@@ -1077,7 +1077,7 @@ class SparkContext(config: SparkConf) extends Logging with ExecutorAllocationCli
 
     // This is a hack to enforce loading hdfs-site.xml.
     // See SPARK-11227 for details.
-    FileSystem.get(new URI(path), hadoopConfiguration)
+    FileSystem.getLocal(hadoopConfiguration)
 
     // The call to NewHadoopJob automatically adds security credentials to conf,
     // so we don't need to explicitly add them ourselves