ipatests: Update expectations for test_detect_container
    
    Since https://github.com/systemd/systemd/pull/17902/commits/a4a9a6f7c6e9cd9e219c56d08434a04bc2f395ff
    systemd improves the detection of Docker and Podman containers based
    on the presence of files-markers.
    
    ```console
    [slev@test systemd]$ git describe --contains --tags a4a9a6f7c6e9cd9e219c56d08434a04bc2f395ff
    v248-rc1~155^2~1
    ```
    
    Note: on Azure unit tests are run as non-privileged user in non-systemd
    inited container.
    
    This worked on F32 because:
    ```console
    [root@6d2aad38f62c /]# rpm -q systemd
    systemd-245.9-1.fc32.x86_64
    ```
    So, actual comparison in test was `assert None == None`.
    
    But F34 has:
    ```console
    [root@1ff1325f5a61 /]# rpm -q systemd
    systemd-248-2.fc34.x86_64
    ```
    So, the test's expectations should be updated.
    Unfortunately, this is incompatible with older versions of systemd
    (< v248).
    
    See https://github.com/systemd/systemd/pull/17902 for details.
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>