flow: Move flow_extract_stats() to dpif.c, as dpif_flow_stats_extract().

The "flow" module is concerned only with OpenFlow flows these days.  It
shouldn't have anything to do with ODP or dpifs.  However, it included
dpif.h just to implement flow_extract_stats().  This function is a better
fit for dpif.c, so this commit moves it there and removes the dpif.h
#include from flow.h and flow.c

This commit also removes a few more dpif.h #includes that weren't needed.

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/dpif.h b/lib/dpif.h
index b572d0fb..f8332194 100644
--- a/lib/dpif.h
+++ b/lib/dpif.h
@@ -32,6 +32,7 @@ extern "C" {
 
 struct dpif;
 struct ds;
+struct flow;
 struct nlattr;
 struct ofpbuf;
 struct sset;
@@ -115,6 +116,8 @@ struct dpif_flow_stats {
     uint8_t tcp_flags;
 };
 
+void dpif_flow_stats_extract(const struct flow *, struct ofpbuf *packet,
+                             struct dpif_flow_stats *);
 void dpif_flow_stats_format(const struct dpif_flow_stats *, struct ds *);
 
 enum dpif_flow_put_flags {