Fixed exit code

SiteTests/MonteCarlo/tests/CE-cms-mc

@@ -55,7 +55,7 @@ if [[ $rc != 0 ]]
 then
     echo "WMAgent Error: Python2.6 isn't available on this worker node." >&2
     echo "WMAgent Error: WMCore/WMAgent REQUIRES python2.6" >&2
-    exit 3   
+    exit $SAME_ERROR  
 else
     echo "WMAgent found python2.6 at.."
     echo `which python2.6`