Add test_volumes_list functions in test_volumes_list.py.

This patch has added two test functions which includes
    test_volumes_list_by_bootable
    test_volumes_list_details_by_bootable
in test_volumes_list.py and matching with the corresponding
explanation docs.

Change-Id: I8259407984d47f36c03d42ec672182f3c326bdf6
1 file changed