ofp-msgs: Added ONF_ and NXT_REQUESTFORWARD for OF1.0-1.3

ofp-msgs: Added ONF_ and NXT_REQUESTFORWARD for OF1.0-1.3

Backported OFPT14_REQUESTFORWARD to OF1.0-1.3.
OF 1.0-1.2 use an NXT Nicira extension while OF 1.3
uses an ONF extension (ONF version is specified in a
previously published ONF spec sheet).

Includes ofp-print tests for multiple inner message
types, and multiple OF versions including the NXT and ONF.
Also includes more end-to-end ofproto tests for both
NXT OF1.0 and also ONF OF1.3.

VMware-BZ: 2136594
Signed-off-by: Zak Whittington <zwhitt.vmware@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>