Add --dns-option to docker run and hide --dns-opt

This fix is a follow up to #27567 based on:
https://github.com/docker/docker/pull/27567#issuecomment-259295055

In #27567, `--dns-options` has been added to `service create/update`,
together with `--dns` and `--dns-search`. The `--dns-opt` was used
in `docker run`.

This fix add `--dns-option` (not `--dns-options`) to `docker run/create`, and hide
`--dns-opt`. It is still possible to use `--dns-opt` with
`docker run/create`, though it will not show up in help output.

This fix change `--dns-options`to --dns-option` for `docker service create`
and `docker service update`.

This fix also updates the docs and bash/zsh completion scripts.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

docs/reference/commandline/create.md

@@ -50,7 +50,7 @@ Options:
       --device-write-iops value     Limit write rate (IO per second) to a device (default [])
       --disable-content-trust       Skip image verification (default true)
       --dns value                   Set custom DNS servers (default [])
-      --dns-opt value               Set DNS options (default [])
+      --dns-option value            Set DNS options (default [])
       --dns-search value            Set custom DNS search domains (default [])
       --entrypoint string           Overwrite the default ENTRYPOINT of the image
   -e, --env value                   Set environment variables (default [])