wgengine/magicsock: rename discoEndpoint.wgEndpointHostPort to wgEndpoint

Fields rename only.

Part of the general effort to make our code agnostic about endpoint formatting.
It's just a name, but it will soon be a misleading one; be more generic.
Do this as a separate commit because it generates a lot of whitespace changes.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

wgengine/magicsock/magicsock.go

@@ -2771,7 +2771,7 @@ func (c *Conn) ParseEndpoint(keyAddrs string) (conn.Endpoint, error) {
 		publicKey:     tailcfg.NodeKey(pk),        // peer public key (for WireGuard + DERP)
 		discoKey:      tailcfg.DiscoKey(discoKey), // for discovery mesages
 		discoShort:    tailcfg.DiscoKey(discoKey).ShortString(),
-		wgEndpointHostPort: addrs,
+		wgEndpoint:    addrs,
 		sentPing:      map[stun.TxID]sentPing{},
 		endpointState: map[netaddr.IPPort]*endpointState{},
 	}
@@ -3115,7 +3115,7 @@ type discoEndpoint struct {
 	discoKey   tailcfg.DiscoKey // for discovery mesages
 	discoShort string           // ShortString of discoKey
 	fakeWGAddr netaddr.IPPort   // the UDP address we tell wireguard-go we're using
-	wgEndpointHostPort string           // string from ParseEndpoint: "<hex-discovery-key>.disco.tailscale:12345"
+	wgEndpoint string           // string from ParseEndpoint: "<hex-discovery-key>.disco.tailscale:12345"
 
 	// Owned by Conn.mu:
 	lastPingFrom netaddr.IPPort
@@ -3295,7 +3295,7 @@ func (de *discoEndpoint) String() string {
 func (de *discoEndpoint) ClearSrc()           {}
 func (de *discoEndpoint) SrcToString() string { panic("unused") } // unused by wireguard-go
 func (de *discoEndpoint) SrcIP() net.IP       { panic("unused") } // unused by wireguard-go
-func (de *discoEndpoint) DstToString() string { return de.wgEndpointHostPort }
+func (de *discoEndpoint) DstToString() string { return de.wgEndpoint }
 func (de *discoEndpoint) DstIP() net.IP       { panic("unused") }
 func (de *discoEndpoint) DstToBytes() []byte  { return packIPPort(de.fakeWGAddr) }