rest_firewall: Compare reserved port in str representation
rest_firewall: Compare reserved port in str representation

Along with the update of ofctl_rest, the output representation of
the port number in the OUTPUT action has been changed.
e.g.) In case of the OUTPUT action to the OFPP_NORMAL port
  OLD:
    'OUTPUT:4294967290'  # OFPP_NORMAL = 0xfffffffa
  NOW:
    'OUTPUT:NORMAL'

Currently, rest_firewall suposes the OLD format, and it will fail
to compare the port number, then all firewall rules will be shown
with "actions": "DENY".
This patch fixes to compare the port number in the NEW format and
fixes this problem.

Reported-by: Hong Panha <137695b36aa332d9ef408ac55a0549b346ce114c@edu.teu.ac.jp>
Reported-by: Ruy Takata <6be6a94a2ab09bff84457153a16a696f760d2217@gmail.com>
Signed-off-by: IWASE Yusuke <bb80e84cc9f5a8f01385872ee89032beb5d4eba7@gmail.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

lagopus/ryu-lagopus-ext,shinpeimuraoka/ryu,pichuang/ryu,lagopus/ryu-lagopus-ext,pichuang/ryu,fujita/ryu,shinpeimuraoka/ryu,shinpeimuraoka/ryu,shinpeimuraoka/ryu,gareging/SDN_Framework,lagopus/ryu-lagopus-ext,iwaseyusuke/ryu,gareging/SDN_Framework,iwaseyusuke/ryu,osrg/ryu,osrg/ryu,osrg/ryu,gareging/SDN_Framework,osrg/ryu,fujita/ryu,lagopus/ryu-lagopus-ext,gareging/SDN_Framework,lagopus/ryu-lagopus-ext,iwaseyusuke/ryu,pichuang/ryu,shinpeimuraoka/ryu,iwaseyusuke/ryu,fujita/ryu,osrg/ryu,pichuang/ryu,gareging/SDN_Framework,pichuang/ryu,fujita/ryu,iwaseyusuke/ryu,fujita/ryu