Tibor Vass 416b7bb23f install/uninstall: allow aliasing buildx to `docker builder`
Currently the user can type `docker buildx` to use this tool.
This patch allows the user to install buildx as a `docker builder` alias.

As an additional benefit, this allows the regular `docker build` to hook
into `buildx build`.

Note that the install and uninstall commands are currently hidden.

Signed-off-by: Tibor Vass <tibor@docker.com>
..
config.go vendor: initial vendor
duration.go vendor: initial vendor
env.go vendor: initial vendor
envfile.go vendor: initial vendor
file.go vendor: initial vendor
gpus.go vendor: initial vendor
hosts.go vendor: initial vendor
hosts_unix.go vendor: initial vendor
hosts_windows.go vendor: initial vendor
ip.go vendor: initial vendor
mount.go vendor: initial vendor
network.go install/uninstall: allow aliasing buildx to `docker builder`
opts.go vendor: initial vendor
opts_unix.go vendor: initial vendor
opts_windows.go vendor: initial vendor
parse.go vendor: initial vendor
port.go vendor: initial vendor
quotedstring.go vendor: initial vendor
runtime.go vendor: initial vendor
secret.go vendor: initial vendor
throttledevice.go vendor: initial vendor
ulimit.go vendor: initial vendor
weightdevice.go vendor: initial vendor