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Hi,

neutronclient is now dropping XML support and as a result
"--request-format" option is no longer needed as JSON is the only format now.

What is the recommended way for options no longer needed?
Does bumping major version of CLI allow us to drop an option without
deprecation?

- Deprecate such option.
  The option still exists with only one available choiceuntil the
option is deleted.

- Drop it without deprecation.
  This breaks users who uses "--requiest-format json", but 'json' is the default
  value and most users do not specify the option.

Thanks,
Akihiro