net/packet: rename from wgengine/packet.

Signed-off-by: David Anderson <danderson@tailscale.com>

wgengine/filter/filter.go

@@ -13,9 +13,9 @@ import (
 
 	"github.com/golang/groupcache/lru"
 	"golang.org/x/time/rate"
+	"tailscale.com/net/packet"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/logger"
-	"tailscale.com/wgengine/packet"
 )
 
 type filterState struct {

wgengine/filter/filter_test.go

@@ -12,8 +12,8 @@ import (
 	"strings"
 	"testing"
 
+	"tailscale.com/net/packet"
 	"tailscale.com/types/logger"
-	"tailscale.com/wgengine/packet"
 )
 
 var Unknown = packet.Unknown

wgengine/filter/match.go

@@ -10,7 +10,7 @@ import (
 	"net"
 	"strings"
 
-	"tailscale.com/wgengine/packet"
+	"tailscale.com/net/packet"
 )
 
 func NewIP(ip net.IP) packet.IP4 {