message: In configure.py, print info on --config=v1 instead of --config=v2.
  Explicitly listing --config=v2 incorrectly implied that building for TF2 was not the default.
diff: @@ -1466,7 +1466,7 @@ def main():
  config_info_line(
  'dynamic_kernels',
  '(Experimental) Build kernels into separate shared objects.')
  - config_info_line('v2', 'Build TensorFlow 2.x instead of 1.x.')
  + config_info_line('v1', 'Build with TensorFlow 1 API instead of TF 2 API.')
  print('Preconfigured Bazel build configs to DISABLE default on features:')
  config_info_line('nogcp', 'Disable GCP support.')
  