[SPARK-5664][BUILD] Restore stty settings when exiting from SBT's spark-shell

For launching spark-shell from SBT.

Author: Liang-Chi Hsieh <viirya@gmail.com>

Closes #4451 from viirya/restore_stty and squashes the following commits:

fdfc480 [Liang-Chi Hsieh] Restore stty settings when exit (for launching spark-shell from SBT).

1 files changed, 1 insertions, 1 deletions

diff --git a/build/sbt-launch-lib.bash b/build/sbt-launch-lib.bash
index 5e0c640fa5..504be48b35 100755
--- a/build/sbt-launch-lib.bash
+++ b/build/sbt-launch-lib.bash
@@ -81,7 +81,7 @@ execRunner () {
     echo ""
   }
 
-  exec "$@"
+  "$@"
 }
 
 addJava () {