docs: add API versions v1.25 - v1.29, v1.38 - v1.40

Adding separate documents for older API versions, so that these don't have to
be collected from each tag/release branch:

- v1.40 - docker v19.03
- v1.39 - docker v18.09
- v1.38 - docker v18.06
- v1.29 - docker v17.05
- v1.28 - docker v17.04
- v1.27 - docker v17.03
- v1.26 - docker v1.13.1
- v1.25 - docker v1.13.0

Note that:

- API versions v1.30 - v1.37 are yet to be added after the tags and release-
  branches from the docker/docker-ce mono-repo have been extracted.
- docker v1.13.0 made the switch from using a markdown file to using swagger
  to document the API.

Approach taken:

    git mv api/swagger.yaml api/swagger-current.yaml

    git checkout upstream/19.03 -- api/swagger.yaml
    git mv api/swagger.yaml docs/api/v1.40.yaml

    git checkout v18.09.9 -- api/swagger.yaml
    git mv api/swagger.yaml docs/api/v1.39.yaml

    git checkout v18.06.3-ce -- api/swagger.yaml
    git mv api/swagger.yaml docs/api/v1.38.yaml

    git checkout v17.05.0-ce -- api/swagger.yaml
    git mv api/swagger.yaml docs/api/v1.29.yaml

    git checkout v17.04.0-ce -- api/swagger.yaml
    git mv api/swagger.yaml docs/api/v1.28.yaml

    git checkout v17.03.2-ce -- api/swagger.yaml
    git mv api/swagger.yaml docs/api/v1.27.yaml

    git checkout v1.13.1 -- api/swagger.yaml
    git mv api/swagger.yaml docs/api/v1.26.yaml

    git checkout v1.13.0 -- api/swagger.yaml
    git mv api/swagger.yaml docs/api/v1.25.yaml

    git mv api/swagger-current.yaml api/swagger.yaml

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 6fdbc50084dc3be9107cf7fb6e0731e29fbe7995)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: cb5a2beaffb08407c91f2df2fe4482ac83bf58e0
Component: engine

Author: thaJeztah