ftests: Add an lscgroup test with a single '-g' flag

ftests: Add an lscgroup test with a single '-g' flag

Add a test that invokes lscgroup with a single '-g' flag.

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Test Results:
        Run Date:                          Mar 25 16:34:25
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                                    Time (sec)
        ---------------------------------------------------------
        setup                                        18.41
        031-lscgroup-g_flag.py                        0.58
        teardown                                      0.00
        ---------------------------------------------------------
        Total Run Time                               18.98

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>