ofctl_v1_0: Add nw_tos field to match_to_str()

Add missed field in match dictionary when ofctl gets flow entries from a switch.

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
doc: Add tables about match and actions structures

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>