ftests: Add a test for the memory abstraction layer

ftests: Add a test for the memory abstraction layer

Add a test for the memory abstraction layer abstractions.
Currently only supports:
            memory.max <-> memory.limit_in_bytes
            memory.high <-> memory.soft_limit_in_bytes

-----------------------------------------------------------------
Test Results:
        Run Date:                          Apr 14 14:52:47
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                              Time (sec)
        --------------------------------------------
        setup                                   0.00
        093-cgxget-memory_settings.py           3.34
        teardown                                0.00
        --------------------------------------------
        Total Run Time                          3.34

[Kamalesh removed the unused exceptions variable (lint warnings)]
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>