binding: handle ovs ofport update #2092

Job	Run time
linux gcc --disable-ssl	4m 51s
linux clang --disable-ssl	3m 18s
linux gcc test -500	22m 58s
linux gcc test 501-1000	14m 57s
linux gcc test 1001-	6m 35s
linux clang test sanitizers -300	13m 56s
linux clang test sanitizers 301-600	30m 49s
linux clang test sanitizers 601-900	12m 32s
linux clang test sanitizers 901-1200	11m 16s
linux clang test sanitizers 1201-	8m 9s
linux gcc test -ljemalloc -500	27m 36s
linux gcc test -ljemalloc 501-1000	16m 39s
linux gcc test -ljemalloc 1001-	6m 32s
linux clang test -ljemalloc -500	24m 54s
linux clang test -ljemalloc 501-1000	14m 32s
linux clang test -ljemalloc 1001-	7m 14s
linux gcc system-test -100	15m 58s
linux gcc system-test 101-200	22m 9s
linux gcc system-test 201-	19m 53s
linux clang system-test sanitizers -100	17m 22s
linux clang system-test sanitizers 101-200	23m 40s
linux clang system-test sanitizers 201-	22m 50s
linux x86 gcc --disable-ssl	3m 27s
osx clang --disable-ssl	4m 55s
	5h 57m 2s

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