Action structure. See the section 7.2.5 of the OpenFlow 1.3.4 specification
val sizeof : t ‑> intval marshal : Cstruct.t ‑> t ‑> intval parse : Cstruct.t ‑> tval parse_sequence : Cstruct.t ‑> sequenceval from_of_action : OpenFlow.action ‑> tval from_of_seq : OpenFlow.seq ‑> sequence