all: convert more code to use net/netip directly

perl -i -npe 's,netaddr.IPPrefixFrom,netip.PrefixFrom,' $(git grep -l -F netaddr.)
    perl -i -npe 's,netaddr.IPPortFrom,netip.AddrPortFrom,' $(git grep -l -F netaddr. )
    perl -i -npe 's,netaddr.IPPrefix,netip.Prefix,g' $(git grep -l -F netaddr. )
    perl -i -npe 's,netaddr.IPPort,netip.AddrPort,g' $(git grep -l -F netaddr. )
    perl -i -npe 's,netaddr.IP\b,netip.Addr,g' $(git grep -l -F netaddr. )
    perl -i -npe 's,netaddr.IPv6Raw\b,netip.AddrFrom16,g' $(git grep -l -F netaddr. )
    goimports -w .

Then delete some stuff from the net/netaddr shim package which is no
longer neeed.

Updates #5162

Change-Id: Ia7a86893fe21c7e3ee1ec823e8aba288d4566cd8
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

net/netcheck/netcheck_test.go

@@ -9,6 +9,7 @@ import (
 	"context"
 	"fmt"
 	"net"
+	"net/netip"
 	"reflect"
 	"sort"
 	"strconv"
@@ -17,7 +18,6 @@ import (
 	"time"
 
 	"tailscale.com/net/interfaces"
-	"tailscale.com/net/netaddr"
 	"tailscale.com/net/stun"
 	"tailscale.com/net/stun/stuntest"
 	"tailscale.com/tailcfg"
@@ -28,14 +28,14 @@ func TestHairpinSTUN(t *testing.T) {
 	c := &Client{
 		curState: &reportState{
 			hairTX:      tx,
-			gotHairSTUN: make(chan netaddr.IPPort, 1),
+			gotHairSTUN: make(chan netip.AddrPort, 1),
 		},
 	}
 	req := stun.Request(tx)
 	if !stun.Is(req) {
 		t.Fatal("expected STUN message")
 	}
-	if !c.handleHairSTUNLocked(req, netaddr.IPPort{}) {
+	if !c.handleHairSTUNLocked(req, netip.AddrPort{}) {
 		t.Fatal("expected true")
 	}
 	select {