Move the doctor command into a subfolder:

- Adding a new `ssl` option to bundle doctor will make the `Doctor`
  command quite bloated. The "diagnose ssl" option will also have
  children option to allow passing which host or which tls version
  you want to diagnose and I feel these options don't belong in the
  doctor command.
  So my intention in this commit is to prepare to have a new `Doctor`
  subcommand and allow for better organisation of the code:

  The command will be:

  `bundle doctor` -> Run exactly the same as before.
  `bundle doctor --ssl` -> Run the doctor command and diagnose SSL
  with default options (rubygems.org as the host and verify peer as
  the verify mode)
  `bundle doctor ssl --host github.com` -> Run the ssl subcommand and
  pass a specific host.

  This commit just renames a file in order to avoid big diff chunks.

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