Drop the port from DockerInsecureRegistryAddress
Drop the port from DockerInsecureRegistryAddress

This is causing a problem with buildah/podman when they consume the
populated /etc/containers/registries.conf. When deployed with docker
the original behaviour is maintained.

Change-Id: I1f2f2690330af1f7b143c01affe088f954df8d7c
Closes-Bug: #1831152

openstack/python-tripleoclient