of13: support OFPAactionExperimenter with data
of13: support OFPAactionExperimenter with data

The length check assert was added by FUJITA since the spec says that
lenght of data should be a multiple of 8.

Signed-off-by: Rob Udechukwu <b4b8798b2eeab8d7d844764d0282e95b55e8c77c@ncsu.edu>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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