This makes it possible to enable shim debug by adding the following to
`config.toml`:
[plugins.linux]
shim_debug = true
I moved the debug setting from the `client.Config struct` to an argument to
`client.WithStart` since this is the only place it would be used.
Signed-off-by: Ian Campbell <ian.campbell@docker.com>
This moves the shim's API and protos out of the containerd services
package and into the linux runtime package. This is because the shim is
an implementation detail of the linux runtime that we have and it is not
a containerd user facing api.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
