tests/integrated: Match on IP dl_type for flows with dec NW TTL actions
tests/integrated: Match on IP dl_type for flows with dec NW TTL actions

OpenFlow 1.2 section 6.7 describes inconsistent action in a flow
as an action whose operation is inconsistent with the flows match.

In terms of the above the dec NW TTL action is inconsistent if
it the flow does not match on the IPv4 or IPv6 dl_type because
the action manipulates either the IPv4 TTL or the IPv6 hop limit.

This patch splits the testing of the dec NW TTL action into two tests,
one for each of IPv4 and IPv6, including a match on the corresponding
dl_type in the flow.

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