Add support to dump free_flags as below format:
Free bit in mbuf->ol_flags (0 = occupied, 1 = free):
0000: 0 0 0 0 0 0 0 0
0008: 0 0 0 0 0 0 0 0
0010: 0 0 0 0 0 0 0 1
0018: 1 1 1 1 1 1 1 1
0020: 1 1 1 1 1 1 1 1
0028: 1 0 0 0 0 0 0 0
0030: 0 0 0 0 0 0 0 0
0038: 0 0 0 0 0 0 0 0
Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>