[freeipa PR#6095][opened] subid: test with podman

[fcami]

   URL: https://github.com/freeipa/freeipa/pull/6095
Author: fcami
 Title: #6095: subid: test with podman
Action: opened

PR body:
"""
podman can leverage FreeIPA-managed subids provided:
- nsswitch.conf contains "subid: sss"
- a real session is opened for that user (not su)

podman provides also a way to test whether subids can be retrieved:
$ podman unshare cat /proc/self/uid_map
$ podman unshare cat /proc/self/gid_map

Fixes: TBD
Signed-off-by: François Cami <fcami(a)redhat.com&gt;
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/6095/head:pr6095
git checkout pr6095