ipn/ipnlocal: populate self status from netmap in ipnlocal, not magicsock.

Fixes #1933

Signed-off-by: David Anderson <danderson@tailscale.com>

wgengine/magicsock/magicsock.go

@@ -17,7 +17,6 @@ import (
 	"math"
 	"math/rand"
 	"net"
-	"os"
 	"reflect"
 	"runtime"
 	"sort"
@@ -3129,18 +3128,6 @@ func (c *Conn) UpdateStatus(sb *ipnstate.StatusBuilder) {
 			ss.Addrs = append(ss.Addrs, ep.Addr.String())
 		}
 		ss.OS = version.OS()
-		if c.netMap != nil {
-			ss.HostName = c.netMap.Hostinfo.Hostname
-			ss.DNSName = c.netMap.Name
-			ss.UserID = c.netMap.User
-			if c.netMap.SelfNode != nil {
-				if c := c.netMap.SelfNode.Capabilities; len(c) > 0 {
-					ss.Capabilities = append([]string(nil), c...)
-				}
-			}
-		} else {
-			ss.HostName, _ = os.Hostname()
-		}
 		if c.derpMap != nil {
 			derpRegion, ok := c.derpMap.Regions[c.myDerp]
 			if ok {