Handle KeyboardInterrupt consistently in python scripts

Handle KeyboardInterrupt gracefully rather the printing a
backtrace. Most users of these tools don't expect a
backtrace when then hit Ctrl-C.

Also, fix a few other inconsistencies found in the python
startup code of these different scripts:
- always call main function 'main' (rather than 'Main')
- always return 0 from main function
- if main takes args never include argv[0]

Review URL: https://codereview.chromium.org/955993006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@294250 0039d316-1c4b-4281-b951-d872f2087c98

upload_to_google_storage.py

@@ -203,7 +203,7 @@ def upload_to_google_storage(
   return max_ret_code
 
 
-def main(args):
+def main():
   parser = optparse.OptionParser(USAGE_STRING)
   parser.add_option('-b', '--bucket',
                     help='Google Storage bucket to upload to.')
@@ -248,4 +248,8 @@ def main(args):
 
 
 if __name__ == '__main__':
-  sys.exit(main(sys.argv))
+  try:
+    sys.exit(main())
+  except KeyboardInterrupt:
+    sys.stderr.write('interrupted\n')
+    sys.exit(1)