netlink: Rename pid to portid to avoid confusion

It is a frequent mistake to confuse the netlink port identifier with a
process identifier.  Try to reduce this confusion by renaming fields
that hold port identifiers portid instead of pid.

I have carefully avoided changing the structures exported to
userspace to avoid changing the userspace API.

I have successfully built an allyesconfig kernel with this change.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index 129ec54..031dfbf 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -129,7 +129,7 @@
 	u8 cmd;
 	const struct sw_flow_key *key;
 	const struct nlattr *userdata;
-	u32 pid;
+	u32 portid;
 };
 
 static inline struct net *ovs_dp_get_net(struct datapath *dp)