ofctl_v1_3.py: Add get_desc_stats & get_port_stats from ofctl_v1_0.py.
ofctl_v1_3.py: Add get_desc_stats & get_port_stats from ofctl_v1_0.py.

ofctl_v1_3 lacks of get_desc_stats & get_port_stats methods which is available
in ofctl_v1_0. I copied the code from ofctl_v1_0 and it works fine. The only
change to get_port_stats in ofctl_v1_3 is using OFPP_ANY as argument to call
OFPPortStatsRequest.

Signed-off-by: Wei-Li Tang <5d755dd15206b0463ba6e773187c465627300b40@xinguard.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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