Description of problem:

Rootless podman containers are Tech Preview for RHEL 7.7+ and RHEL 8, so by default the user on these systems will need to run the podman commands to extract our operator and controller files with sudo.

However it is also possible to have configured a system for rootless podman containers, and for these systems sudo is not required. The docs should be updated to use sudo by default, with a note that indicates if the user's system has been configured for rootless podman containers, sudo is not required:

```
.Procedure

. Log in to the Red Hat Container Registry with your Red Hat Customer Portal credentials:
+
----
$ sudo podman login registry.redhat.io
----

. Download the `operator.yml` file:
+
----
$ sudo podman cp $(podman create registry.redhat.io/rhcam-1-0/openshift-migration-rhel7-operator:v1.0 ):/operator.yml ./
----

. Download the `controller-3.yml` file:
+
----
$ sudo podman cp $(podman create registry.redhat.io/rhcam-1-0/openshift-migration-rhel7-operator:v1.0 ):/controller-3.yml ./
----

NOTE: If the user's system has been configured for rootless podman containers, sudo can be omitted from the above commands.
```