Make gclient_scm_test much more silent

gclient_utils.py

 # Copyright 2009 Google Inc.  All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 18 matching lines @@
 
 class Error(Exception):
   """gclient exception class."""
   pass
 
 
 class CheckCallError(OSError, Error):
   """CheckCall() returned non-0."""
   def __init__(self, command, cwd, returncode, stdout, stderr=None):
     OSError.__init__(self, command, cwd, returncode, stdout, stderr)
-    Error.__init__(self)
+    Error.__init__(self, command)
     self.command = command
     self.cwd = cwd
     self.returncode = returncode
     self.stdout = stdout
     self.stderr = stderr
 
   def __str__(self):
     out = ' '.join(self.command)
     if self.cwd:
       out += ' in ' + self.cwd
@@ skipping 534 matching lines @@
         if exception:
           self.parent.exceptions.append(exception)
         if self.parent.progress:
           self.parent.progress.update(1)
         assert not self.item.name in self.parent.ran
         if not self.item.name in self.parent.ran:
           self.parent.ran.append(self.item.name)
       finally:
         self.parent.ready_cond.notifyAll()
         self.parent.ready_cond.release()