ftests: Add cgroup_get_cgroup() pybindings test

ftests: Add cgroup_get_cgroup() pybindings test

Add a test to exercise cgroup_get_cgroup() and its python bindings.

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Test Results:
	Run Date:                          Feb 15 14:50:00
	Passed:                                  1 test(s)
	Skipped:                                 0 test(s)
	Failed:                                  0 test(s)
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Timing Results:
	Test                                    Time (sec)
	--------------------------------------------------
	setup                                         0.00
	072-pybindings-cgroup_get_cgroup.py           2.66
	teardown                                      0.00
	--------------------------------------------------
	Total Run Time                                2.66

Reviewed-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
(cherry picked from commit 62426a9b1395c34b2527eb1b193eaaa8b5906b35)