Use new common utils where possible.

slave/skia_slave_scripts/check_buildslave_host_disk_usage.py

 #!/usr/bin/env python
 # Copyright (c) 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 """Verify that the buildslave host machines are under a disk usage threshold."""
 
 
 import re
 import sys
 
 from build_step import BuildStep, BuildStepWarning, BuildStepFailure
-from utils import misc
+from py.utils import misc
 
 sys.path.append(misc.BUILDBOT_PATH)
 
 from scripts import run_cmd
 
 
 MAX_DISK_USAGE_PERCENT = 90
 
 
 def get_disk_usage_percent(stdout):
@@ skipping 49 matching lines @@
       raise BuildStepFailure('Some hosts are over threshold.')
 
     if failed:
       # TODO(borenet): Make sure that we can log in to all hosts, then make this
       # an error.
       raise BuildStepWarning('Could not log in to some hosts.')
 
 
 if '__main__' == __name__:
   sys.exit(BuildStep.RunBuildStep(CheckSlaveHostsDiskUsage))