Remove unnecessary double-shell.

Default shell for ChromeOS test image is bash. The line in question causes an extra instance of bash to be spawned.

Removing the line fixes the shell-init errors.

Change-Id: Icea100dc3c4f5dbf12f2185213a64afe528cacbf

BUG=chromium-os:9425
TEST=Ran in production. Errors disappeared.

Review URL: http://codereview.chromium.org/5515009
diff --git a/client/common_lib/utils.py b/client/common_lib/utils.py
index 47f3cb4..a6fa61d 100644
--- a/client/common_lib/utils.py
+++ b/client/common_lib/utils.py
@@ -75,7 +75,12 @@
         self.sp = subprocess.Popen(command, stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE,
                                    preexec_fn=self._reset_sigpipe, shell=True,
-                                   executable="/bin/bash",
+
+                                   # Default shell in ChromeOS test image is
+                                   # already bash. We're seeing shell-init
+                                   # errors if this value is set.
+                                   
+                                   #executable="/bin/bash",
                                    stdin=stdin)