wgengine: log node IDs when peers are added/removed (#381)

Also stop logging data sent/received from nodes we're not connected to (ie all those `x`s being logged in the `peers: ` line)
Signed-off-by: Wendi <wendi.yu@yahoo.ca>

cmd/tailscaled/tailscaled.go

@@ -15,6 +15,7 @@ import (
 	"net/http"
 	"net/http/pprof"
 	"runtime"
+	"time"
 
 	"github.com/apenwarr/fixconsole"
 	"github.com/pborman/getopt/v2"
@@ -52,7 +53,7 @@ func main() {
 	socketpath := getopt.StringLong("socket", 's', paths.DefaultTailscaledSocket(), "Path of the service unix socket")
 
 	logf := wgengine.RusagePrefixLog(log.Printf)
-	logf = logger.RateLimitedFn(logf, 1, 1, 100)
+	logf = logger.RateLimitedFn(logf, 1*time.Second, 1, 100)
 
 	err := fixconsole.FixConsoleIfNeeded()
 	if err != nil {