[NaCl SDK] Convert python scripts from optparse to argparse.

native_client_sdk/src/build_tools/build_updater.py

Index: native_client_sdk/src/build_tools/build_updater.py
diff --git a/native_client_sdk/src/build_tools/build_updater.py b/native_client_sdk/src/build_tools/build_updater.py
index fc79fbba24bb27c610ac94a0e6c2974cda586ac5..66e0c9ffda5c9c6461f992c852b3b84d4db518c4 100755
--- a/native_client_sdk/src/build_tools/build_updater.py
+++ b/native_client_sdk/src/build_tools/build_updater.py
@@ -9,10 +9,10 @@ This script packages the files necessary to generate the SDK updater -- the
 tool users run to download new bundles, update existing bundles, etc.
 """
 
+import argparse
 import buildbot_common
 import build_version
 import glob
-import optparse
 import os
 import sys
 
@@ -174,13 +174,13 @@ def BuildUpdater(out_dir, revision_number=None):
 
 
 def main(args):
-  parser = optparse.OptionParser()
-  parser.add_option('-o', '--out', help='output directory',
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('-o', '--out', help='output directory',
       dest='out_dir', default=os.path.join(SRC_DIR, 'out'))
-  parser.add_option('-r', '--revision', help='revision number of this updater',
-      dest='revision', default=None)
-  parser.add_option('-v', '--verbose', help='verbose output')
-  options, args = parser.parse_args(args)
+  parser.add_argument('-r', '--revision', dest='revision', default=None,
+      help='revision number of this updater')
+  parser.add_argument('-v', '--verbose', help='verbose output')
+  options = parser.parse_args(args)
 
   buildbot_common.verbose = options.verbose