net/sockstats: wait before reporting battery usage

Wait 2 minutes before we start reporting battery usage. There is always
radio activity on initial startup, which gets reported as 100% high
power usage.  Let that settle before we report usage data.

Updates tailscale/corp#9230

Signed-off-by: Will Norris <will@tailscale.com>

net/sockstats/sockstats_tsgo_test.go

@@ -33,6 +33,14 @@ func TestRadioMonitor(t *testing.T) {
 			func(_ *testTime, _ *radioMonitor) {},
 			0,
 		},
+		{
+			"active less than init stall period",
+			func(tt *testTime, rm *radioMonitor) {
+				rm.active()
+				tt.Add(1 * time.Second)
+			},
+			0, // radio on, but not long enough to report data
+		},
 		{
 			"active, 10 sec idle",
 			func(tt *testTime, rm *radioMonitor) {
@@ -42,13 +50,13 @@ func TestRadioMonitor(t *testing.T) {
 			50, // radio on 5 seconds of 10 seconds
 		},
 		{
-			"active, spanning two seconds",
+			"active, spanning three seconds",
 			func(tt *testTime, rm *radioMonitor) {
 				rm.active()
-				tt.Add(1100 * time.Millisecond)
+				tt.Add(2100 * time.Millisecond)
 				rm.active()
 			},
-			100, // radio on for 2 seconds
+			100, // radio on for 3 seconds
 		},
 		{
 			"400 iterations: 2 sec active, 1 min idle",
@@ -66,13 +74,17 @@ func TestRadioMonitor(t *testing.T) {
 		{
 			"activity at end of time window",
 			func(tt *testTime, rm *radioMonitor) {
-				tt.Add(1 * time.Second)
+				tt.Add(3 * time.Second)
 				rm.active()
 			},
-			50,
+			25,
 		},
 	}
 
+	oldStallPeriod := initStallPeriod
+	initStallPeriod = 3
+	t.Cleanup(func() { initStallPeriod = oldStallPeriod })
+
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			tm := &testTime{time.Date(2021, 1, 1, 0, 0, 0, 0, time.UTC)}