Previously, the setup only checked for the CAP_SYS_ADMIN capability,
which could be not enough with containerized Podman where
CAP_SYS_ADMIN might be set for an unprivileged user.
Closes: https://github.com/containers/podman/issues/20766
[NO NEW TESTS NEEDED] needs containerized Podman
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>