ftests/081: add support for cgroup hybrid mode

ftests/081: add support for cgroup hybrid mode

Add support for cgroup hybrid mode with controllers in cgroup v2.

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Test Results:
        Run Date:                          Nov 01 10:40:32
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
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Timing Results:
        Test                                             Time (sec)
        -----------------------------------------------------------
        setup                                                  0.00
        081-pybindings-cgrp_get_curr_ctrl_path-v1.py           2.09
        teardown                                               0.00
        -----------------------------------------------------------
        Total Run Time                                         2.09

Suggested-by: Tom Hromatka <tom.hromatka@oracle.com>
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
(cherry picked from commit ca72882b1ddcadfaac8aa4a6432ed5e8f2b3c9f6)