log runtime during ignite run

[silenceshell]

ignite runtime support both docker and containerd, we need to specify that in the logs.

For example, no matter I use docker runtime or containerd runtime, the log is always Docker.

# ignite --runtime docker run silenceshell/weave:docker2  --cpus 1 --memory 4GB --ssh --size 20GB --name vm-docker-2
INFO[0000] Docker image "silenceshell/weave:docker2" not found locally, pulling...
^C
# ignite --runtime containerd run silenceshell/weave:docker2  --cpus 1 --memory 4GB --ssh --size 20GB --name vm-docker-2
INFO[0000] Docker image "silenceshell/weave:docker2" not found locally, pulling...
^C
# ignite run silenceshell/weave:docker2  --cpus 1 --memory 4GB --ssh --size 20GB --name vm-docker-2
INFO[0000] Docker image "silenceshell/weave:docker2" not found locally, pulling...

Also the size checking needs a fix.

[luxas]

Thanks, LGTM 👍