Update ContainerWait API

This patch adds the untilRemoved option to the ContainerWait API which
allows the client to wait until the container is not only exited but
also removed.

This patch also adds some more CLI integration tests for waiting for a
created container and waiting with the new --until-removed flag.

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Handle detach sequence in CLI

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Update Container Wait Conditions

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Apply container wait changes to API 1.30

The set of changes to the containerWait API missed the cut for the
Docker 17.05 release (API version 1.29). This patch bumps the version
checks to use 1.30 instead.

This patch also makes a minor update to a testfile which was added to
the builder/dockerfile package.

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Remove wait changes from CLI

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Address minor nits on wait changes

- Changed the name of the tty Proxy wrapper to `escapeProxy`
- Removed the unnecessary Error() method on container.State
- Fixes a typo in comment (repeated word)

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Use router.WithCancel in the containerWait handler

This handler previously added this functionality manually but now uses
the existing wrapper which does it for us.

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Add WaitCondition constants to api/types/container

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Address more ContainerWait review comments

- Update ContainerWait backend interface to not return pointer values
  for container.StateStatus type.
- Updated container state's Wait() method comments to clarify that a
  context MUST be used for cancelling the request, setting timeouts,
  and to avoid goroutine leaks.
- Removed unnecessary buffering when making channels in the client's
  ContainerWait methods.
- Renamed result and error channels in client's ContainerWait methods
  to clarify that only a single result or error value would be sent
  on the channel.

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Move container.WaitCondition type to separate file

... to avoid conflict with swagger-generated code for API response

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

Address more ContainerWait review comments

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)

docs/reference/commandline/wait.md

@@ -21,7 +21,7 @@ Usage:  docker wait CONTAINER [CONTAINER...]
 Block until one or more containers stop, then print their exit codes
 
 Options:
-      --help   Print usage
+      --help        Print usage
 ```
 
 > **Note**: `docker wait` returns `0` when run against a container which had