SPARK-1607. Replace octal literals, removed in Scala 2.11, with hex literals

Octal literals like "0700" are deprecated in Scala 2.10, generating a warning. They have been removed entirely in 2.11. See https://issues.scala-lang.org/browse/SI-7618

This change simply replaces two uses of octals with hex literals, which seemed the next-best representation since they express a bit mask (file permission in particular)

Author: Sean Owen <sowen@cloudera.com>

Closes #529 from srowen/SPARK-1607 and squashes the following commits:

1ee0e67 [Sean Owen] Use Integer.parseInt(...,8) for octal literal instead of hex equivalent
0102f3d [Sean Owen] Replace octal literals, removed in Scala 2.11, with hex literals

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

@@ -59,9 +59,11 @@ trait ClientBase extends Logging {
   private val distCacheMgr = new ClientDistributedCacheManager()
 
   // Staging directory is private! -> rwx--------
-  val STAGING_DIR_PERMISSION: FsPermission = FsPermission.createImmutable(0700: Short)
+  val STAGING_DIR_PERMISSION: FsPermission =
+    FsPermission.createImmutable(Integer.parseInt("700", 8): Short)
   // App files are world-wide readable and owner writable -> rw-r--r--
-  val APP_FILE_PERMISSION: FsPermission = FsPermission.createImmutable(0644: Short)
+  val APP_FILE_PERMISSION: FsPermission =
+    FsPermission.createImmutable(Integer.parseInt("644", 8): Short)
 
   // TODO(harvey): This could just go in ClientArguments.
   def validateArgs() = {