'docker insert' is an old command which predates 'docker build'. We no
longer recommend using it, it is not actively maintained, and can be
replaced with the combination of 'docker build' and 'ADD'.
This removes the command from usage and documentation, and prints a
warning when it is called.
The command still works but it will be removed in a future version.
Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Upstream-commit: 615ac8feb27b2b3db0c06b37ecd87b710eabffef
Component: engine
