flow: Rename 'priority' to 'skb_priority'.

This priority's mean is completely different from the priority of an
OpenFlow rule, so it is confusing for it to have the same name.

We should be on the lookout for a less Linux-specific name, but this one
seems fine for now.

Signed-off-by: Ben Pfaff <blp@nicira.com>

lib/classifier.c

@@ -74,7 +74,7 @@ cls_rule_init_exact(const struct flow *flow,
                     unsigned int priority, struct cls_rule *rule)
 {
     rule->flow = *flow;
-    rule->flow.priority = 0;
+    rule->flow.skb_priority = 0;
     flow_wildcards_init_exact(&rule->wc);
     rule->priority = priority;
 }