Don't configure KEYRING ccache in containers
Kernel keyrings are not namespaced yet. Keyrings can leak into other
containers. Therefore keyrings should not be used in containerized
environment.
Don't configure Kerberos to use KEYRING ccache backen when a container
environment is detected by systemd-detect-virt --container.
Fixes: https://pagure.io/freeipa/issue/7807
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Tibor Dudlak <tdudlak@redhat.com>
Reviewed-By: Oleg Kozlov <okozlov@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>