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>

cmd/tailscaled/tailscaled_windows.go

@@ -25,6 +25,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"log"
+	"net/netip"
 	"os"
 	"time"
 
@@ -37,7 +38,6 @@ import (
 	"tailscale.com/ipn/store"
 	"tailscale.com/logpolicy"
 	"tailscale.com/net/dns"
-	"tailscale.com/net/netaddr"
 	"tailscale.com/net/tsdial"
 	"tailscale.com/net/tstun"
 	"tailscale.com/safesocket"
@@ -245,7 +245,7 @@ func beFirewallKillswitch() bool {
 	// is passed in via stdin encoded in json.
 	dcd := json.NewDecoder(os.Stdin)
 	for {
-		var routes []netaddr.IPPrefix
+		var routes []netip.Prefix
 		if err := dcd.Decode(&routes); err != nil {
 			log.Fatalf("parent process died or requested exit, exiting (%v)", err)
 		}