all: use various net/netip parse funcs directly

Mechanical change with perl+goimports.

Changed {Must,}Parse{IP,IPPrefix,IPPort} to their netip variants, then
goimports -d .

Finally, removed the net/netaddr wrappers, to prevent future use.

Updates #5162

Change-Id: I59c0e38b5fbca5a935d701645789cddf3d7863ad
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

wgengine/router/router_test.go

@@ -5,6 +5,7 @@
 package router
 
 import (
+	"net/netip"
 	"reflect"
 	"testing"
 
@@ -15,7 +16,7 @@ import (
 func mustCIDRs(ss ...string) []netaddr.IPPrefix {
 	var ret []netaddr.IPPrefix
 	for _, s := range ss {
-		ret = append(ret, netaddr.MustParseIPPrefix(s))
+		ret = append(ret, netip.MustParsePrefix(s))
 	}
 	return ret
 }
@@ -37,7 +38,7 @@ func TestConfigEqual(t *testing.T) {
 
 	nets := func(strs ...string) (ns []netaddr.IPPrefix) {
 		for _, s := range strs {
-			n, err := netaddr.ParseIPPrefix(s)
+			n, err := netip.ParsePrefix(s)
 			if err != nil {
 				panic(err)
 			}