Update config.toml.j2 (#8340)

* Update config.toml.j2

i think this commit code is not completed works

exam registry address : a.com:5000

insecure registry must be http://a.com:5000

but this code add insecure a.com:5000 (without http://)

If there is no http, containerd accesses with https even if insecure_skip_verify = true

solution is code edit

* Update config.toml.j2

* Update containerd.yml

* Update containerd.yml

* Update containerd.yml

* Update config.toml.j2