all: delete wgcfg.Key and wgcfg.PrivateKey

For historical reasons, we ended up with two near-duplicate
copies of curve25519 key types, one in the wireguard-go module
(wgcfg) and one in the tailscale module (types/wgkey).
Then we moved wgcfg to the tailscale module.
We can now remove the wgcfg key type in favor of wgkey.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>

wgengine/wglog/wglog.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/tailscale/wireguard-go/device"
 	"tailscale.com/types/logger"
+	"tailscale.com/types/wgkey"
 	"tailscale.com/wgengine/wgcfg"
 )
 
@@ -86,7 +87,7 @@ func (x *Logger) SetPeers(peers []wgcfg.Peer) {
 }
 
 // wireguardGoString prints p in the same format used by wireguard-go.
-func wireguardGoString(k wgcfg.Key) string {
+func wireguardGoString(k wgkey.Key) string {
 	base64Key := base64.StdEncoding.EncodeToString(k[:])
 	abbreviatedKey := "invalid"
 	if len(base64Key) == 44 {

wgengine/wglog/wglog_test.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"testing"
 
+	"tailscale.com/types/wgkey"
 	"tailscale.com/wgengine/wgcfg"
 	"tailscale.com/wgengine/wglog"
 )
@@ -34,7 +35,7 @@ func TestLogger(t *testing.T) {
 	}
 
 	x := wglog.NewLogger(logf)
-	key, err := wgcfg.ParseHexKey("20c4c1ae54e1fd37cab6e9a532ca20646aff496796cc41d4519560e5e82bee53")
+	key, err := wgkey.ParseHex("20c4c1ae54e1fd37cab6e9a532ca20646aff496796cc41d4519560e5e82bee53")
 	if err != nil {
 		t.Fatal(err)
 	}