ftests: Add a test to validate cgx{get,set} systemd options (cgroup v1)

ftests: Add a test to validate cgx{get,set} systemd options (cgroup v1)

Add a test case to validate cgx(get, set} tool's systemd options on
cgroup legacy/hybrid setup modes.

-----------------------------------------------------------------
Test Results:
        Run Date:                          Feb 05 08:09:43
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                                           Time (sec)
        ---------------------------------------------------------
        setup                                                0.00
        069-sudo-systemd_cgxget-cpu-settings-v1.py           2.74
        teardown                                             0.00
        ---------------------------------------------------------
        Total Run Time                                       2.74

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
(cherry picked from commit c1adfed29ff3d475484ba57d4a910679d9ecc493)