tests/integrated: Enable ARP tests
tests/integrated: Enable ARP tests

Enable ARP tests, they appear to be supported by Open vSwitch.

I noticed this when using Open vSwitch's "make ryu-check" as
Open vSwitch enforces action consistency for the set NW TTL action.

Signed-off-by: Simon Horman <a105fd58f578dea0be108941d4c59d15396e1855@verge.net.au>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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