nicira-ext: Separate nx_aggregate_stats_reply from ofp_aggregate_stats_reply.
An upcoming patch will make stats messages much more like other messages,
in that their structures will include all of the headers. This means that
struct ofp_aggregate_stats_reply will no longer be appropriate as a
member of struct nx_aggregate_stats_reply, because it will then include
those additional header members.
Also, struct nx_aggregate_stats_reply doesn't need to use the special
ovs_32aligned_be64 type, since its 64-bit members are correctly aligned,
which is another reasonable reason to keep it separate.
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