SW-609: Change file into open.

MAC/Services/src/PipelineControl.py

@@ -101,7 +101,7 @@ def runCommand(cmdline, input=None):
   # Start command
   proc = subprocess.Popen(
     cmdline,
-    stdin=subprocess.PIPE if input else file("/dev/null"),
+    stdin=subprocess.PIPE if input else open("/dev/null"),
     stdout=subprocess.PIPE,
     stderr=subprocess.STDOUT,
     shell=True,