tests/integrated: Match on MPLS dl_type for flows with pop MPLS actions
tests/integrated: Match on MPLS dl_type for flows with pop MPLS 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 pop MPLS actions are inconsistent if the flow
does not match on one of the MPLS dl_types.

This patch add such a match for the flow that has a pop MPLS action.

Also enable the pop MPLS test, it appears 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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