[SPARK-14914][CORE][SQL] Skip/fix some test cases on Windows due to limitation of Windows

## What changes were proposed in this pull request?

This PR proposes to fix/skip some tests failed on Windows. This PR takes over https://github.com/apache/spark/pull/12696.

**Before**

- **SparkSubmitSuite**

  ```
[info] - launch simple application with spark-submit *** FAILED *** (202 milliseconds)
[info]   java.io.IOException: Cannot run program "./bin/spark-submit" (in directory "C:\projects\spark"): CreateProcess error=2, The system cannot find the file specifie

[info] - includes jars passed in through --jars *** FAILED *** (1 second, 625 milliseconds)
[info]   java.io.IOException: Cannot run program "./bin/spark-submit" (in directory "C:\projects\spark"): CreateProcess error=2, The system cannot find the file specified
```

- **DiskStoreSuite**

  ```
[info] - reads of memory-mapped and non memory-mapped files are equivalent *** FAILED *** (1 second, 78 milliseconds)
[info]   diskStoreMapped.remove(blockId) was false (DiskStoreSuite.scala:41)
```

**After**

- **SparkSubmitSuite**

  ```
[info] - launch simple application with spark-submit (578 milliseconds)
[info] - includes jars passed in through --jars (1 second, 875 milliseconds)
```

- **DiskStoreSuite**

  ```
[info] DiskStoreSuite:
[info] - reads of memory-mapped and non memory-mapped files are equivalent !!! CANCELED !!! (766 milliseconds
```

For `CreateTableAsSelectSuite` and `FsHistoryProviderSuite`, I could not reproduce as the Java version seems higher than the one that has the bugs about `setReadable(..)` and `setWritable(...)` but as they are bugs reported clearly, it'd be sensible to skip those. We should revert the changes for both back as soon as we drop the support of Java 7.

## How was this patch tested?

Manually tested via AppVeyor.

Closes #12696

Author: Tao LI <tl@microsoft.com>
Author: U-FAREAST\tl <tl@microsoft.com>
Author: hyukjinkwon <gurwls223@gmail.com>

Closes #15320 from HyukjinKwon/SPARK-14914.

1 files changed, 2 insertions, 10 deletions

diff --git a/core/src/main/scala/org/apache/spark/util/Utils.scala b/core/src/main/scala/org/apache/spark/util/Utils.scala
index f3493bd96b..ef832756ce 100644
--- a/core/src/main/scala/org/apache/spark/util/Utils.scala
+++ b/core/src/main/scala/org/apache/spark/util/Utils.scala
@@ -23,7 +23,7 @@ import java.net._
 import java.nio.ByteBuffer
 import java.nio.channels.Channels
 import java.nio.charset.StandardCharsets
-import java.nio.file.Files
+import java.nio.file.{Files, Paths}
 import java.util.{Locale, Properties, Random, UUID}
 import java.util.concurrent._
 import java.util.concurrent.atomic.AtomicBoolean
@@ -1014,15 +1014,7 @@ private[spark] object Utils extends Logging {
    * Check to see if file is a symbolic link.
    */
   def isSymlink(file: File): Boolean = {
-    if (file == null) throw new NullPointerException("File must not be null")
-    if (isWindows) return false
-    val fileInCanonicalDir = if (file.getParent() == null) {
-      file
-    } else {
-      new File(file.getParentFile().getCanonicalFile(), file.getName())
-    }
-
-    !fileInCanonicalDir.getCanonicalFile().equals(fileInCanonicalDir.getAbsoluteFile())
+    return Files.isSymbolicLink(Paths.get(file.toURI))
   }
 
   /**