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>

derp/derphttp/derphttp_client.go

@@ -34,7 +34,6 @@ import (
 	"tailscale.com/derp"
 	"tailscale.com/envknob"
 	"tailscale.com/net/dnscache"
-	"tailscale.com/net/netaddr"
 	"tailscale.com/net/netns"
 	"tailscale.com/net/tlsdial"
 	"tailscale.com/net/tshttpproxy"
@@ -580,7 +579,7 @@ func (c *Client) dialContext(ctx context.Context, proto, addr string) (net.Conn,
 // address (given in s) is valid. An empty value means to dial, but to
 // use DNS. The predicate function reports whether the non-empty
 // string s contained a valid IP address of the right family.
-func shouldDialProto(s string, pred func(netaddr.IP) bool) bool {
+func shouldDialProto(s string, pred func(netip.Addr) bool) bool {
 	if s == "" {
 		return true
 	}
@@ -652,10 +651,10 @@ func (c *Client) dialNode(ctx context.Context, n *tailcfg.DERPNode) (net.Conn, e
 			}
 		}()
 	}
-	if shouldDialProto(n.IPv4, netaddr.IP.Is4) {
+	if shouldDialProto(n.IPv4, netip.Addr.Is4) {
 		startDial(n.IPv4, "tcp4")
 	}
-	if shouldDialProto(n.IPv6, netaddr.IP.Is6) {
+	if shouldDialProto(n.IPv6, netip.Addr.Is6) {
 		startDial(n.IPv6, "tcp6")
 	}
 	if nwait == 0 {
@@ -840,15 +839,15 @@ func (c *Client) SendPing(data [8]byte) error {
 
 // LocalAddr reports c's local TCP address, without any implicit
 // connect or reconnect.
-func (c *Client) LocalAddr() (netaddr.IPPort, error) {
+func (c *Client) LocalAddr() (netip.AddrPort, error) {
 	c.mu.Lock()
 	closed, client := c.closed, c.client
 	c.mu.Unlock()
 	if closed {
-		return netaddr.IPPort{}, ErrClientClosed
+		return netip.AddrPort{}, ErrClientClosed
 	}
 	if client == nil {
-		return netaddr.IPPort{}, errors.New("client not connected")
+		return netip.AddrPort{}, errors.New("client not connected")
 	}
 	return client.LocalAddr()
 }