Configure existing security-groups by `external.name` (#11379)
Configure existing security-groups by `external.name` (#11379)

* Configure existing security-groups by `external.name`

Signed-off-by: Nicolas De Loof <27d8e526c390473e9c51da80626c6b0539b42f4f@gmail.com>

* Minor style updates

Co-authored-by: Usha Mandya <63fc8324d194bb900191b7ad7215ea10fd135fb2@users.noreply.github.com>
docker/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io