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>

net/interfaces/interfaces_linux.go

@@ -12,6 +12,7 @@ import (
 	"io"
 	"log"
 	"net"
+	"net/netip"
 	"os"
 	"os/exec"
 	"runtime"
@@ -125,7 +126,7 @@ func likelyHomeRouterIPAndroid() (ret netaddr.IP, ok bool) {
 			return nil
 		}
 		ipb := line[:sp]
-		if ip, err := netaddr.ParseIP(string(ipb)); err == nil && ip.Is4() {
+		if ip, err := netip.ParseAddr(string(ipb)); err == nil && ip.Is4() {
 			ret = ip
 			log.Printf("interfaces: found Android default route %v", ip)
 		}