Avoid printing user.

envsetup.py

@@ -5,6 +5,7 @@ Environment setup script for MediaServer
 '''
 import imp
 import os
+import subprocess
 import sys
 import traceback
 
@@ -64,8 +65,8 @@ class EnvSetup():
         self.debug = '-d' in args
         if self.debug:
             args.remove('-d')
-        code, out = utils.exec_cmd(['whoami'])
-        if out != 'root' and not self.debug:
+        whoami = subprocess.check_output(['whoami']).decode('utf-8')
+        if whoami != 'root' and not self.debug:
             log('This script should be run as root user.')
             sys.exit(1)
         # Load conf

tester.py

@@ -60,8 +60,8 @@ class Tester():
         debug = '-d' in args
         if debug:
             args.remove('-d')
-        code, out = utils.exec_cmd(['whoami'])
-        if out != 'root' and not debug:
+        whoami = subprocess.check_output(['whoami']).decode('utf-8')
+        if whoami != 'root' and not debug:
             log('This script should be run as root user.')
             sys.exit(1)
         # Load conf