Report all swarming and isolate fatal errors in a consistent way.

isolateserver.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 """Archives a set of files to a server."""
 
 __version__ = '0.2'
 
 import functools
@@ skipping 1634 matching lines @@
     if not options.isolate_server:
       self.error('--isolate-server is required.')
     return options, args
 
 
 def main(args):
   dispatcher = subcommand.CommandDispatcher(__name__)
   try:
     return dispatcher.execute(
         OptionParserIsolateServer(version=__version__), args)
-  except (ConfigError, MappingError) as e:
-    sys.stderr.write('\nError: ')
-    sys.stderr.write(str(e))
-    sys.stderr.write('\n')
+  except Exception as e:
+    tools.report_error(e)
     return 1
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   tools.disable_buffering()
   colorama.init()
   sys.exit(main(sys.argv[1:]))