docker-cli

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Sebastiaan van Stijn 8972e53ad0 cli/command: remove prompt utilities that were for internal use

- The `DisableInputEcho` and `PromptForInput` utilities were added in
  c15ade0c64 as part of a bug-fix, which
  was part of v28.x. [There are no (publicly visible) users][1] of either.
- The `ErrPromptTerminated` was added in v26.x (originally added in
  10bf91a02d, later updated in commit
  7c722c08d0. [It is not used][2]
- The `PromptForConfirmation` was added in [moby@280c872] (docker v1.13.0)
  as part of the `docker <object> prune` subcommands. It was meant for
  internal use but exported to allow re-using it in the `container`,
  `image` (etc.) packages. However, a breaking change to its signature
  was made in 10bf91a02d. It currently
  does [not appear to have any (public) users][2].

This patch removes the `ErrPromptTerminated`, `DisableInputEcho`,
`PromptForInput`, and `PromptForConfirmation` utilities from the
`cli/command` package. The core functionality of these is still
available in the `internal/prompt` package, which we may make
public at some point, but still needs some refining / decoupling.

[moby@280c872]: 280c872366
[1]: https://grep.app/search?f.lang=Go&regexp=true&q=%5C.%28DisableInputEcho%7CPromptForInput%29%5C%28
[2]: https://grep.app/search?f.lang=Go&q=%5C.ErrPromptTerminated
[3]: https://grep.app/search?f.lang=Go&q=.PromptForConfirmation%28

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>