test_oxm: Add UTs for 64-bit experimenter OXMs

Following Open vSwitch, introduce "dp_hash" OXM for testing.

>From their commit log: (commit 508a933809f8a8ede4fb93f1c1e3212799efc16a)
> Testing experimenter OXM is tricky because I do not know of any in
> widespread use.  Two ONF proposals use experimenter OXMs: EXT-256 and
> EXT-233.  EXT-256 is not suitable to implement for testing because its use
> of experimenter OXM is wrong and will be changed.  EXT-233 is not suitable
> to implement for testing because it requires adding a new field to struct
> flow and I am not yet convinced that that field and the feature that it
> supports is worth having in Open vSwitch.  Thus, this commit assigns an
> experimenter OXM code point to an existing OVS field that is currently
> restricted from use by controllers, "dp_hash", and uses that for testing.
> Because controllers cannot use it, this leaves future versions of OVS free
> to drop the support for the experimenter OXM for this field without causing
> backward compatibility problems.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

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