ftests: Add a test for creating a systemd scope

ftests: Add a test for creating a systemd scope

Add a test to exercise cgroup_create_scope2().

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Test Results:
        Run Date:                          Nov 18 16:12:16
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                                  Time (sec)
        ------------------------------------------------
        setup                                       0.00
        058-sudo-systemd_create_scope2.py           2.05
        teardown                                    0.00
        ------------------------------------------------
        Total Run Time                              2.05

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
Reviewed-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>