Fix panic in stop when the VM goes away

Signed-off-by: Oleksandr Redko <oleksandr.red+github@gmail.com>

pkg/hostagent/events/watcher_test.go

@@ -0,0 +1,33 @@
+package events
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"gotest.tools/v3/assert"
+)
+
+func TestWatch(t *testing.T) {
+	t.Run("no panic when stdout file is removed", func(t *testing.T) {
+		stdout, err := os.CreateTemp(t.TempDir(), "")
+		assert.NilError(t, err)
+		t.Cleanup(func() { stdout.Close() })
+		stderr, err := os.CreateTemp(t.TempDir(), "")
+		assert.NilError(t, err)
+		t.Cleanup(func() { stderr.Close() })
+		ch := make(chan struct{}, 1)
+
+		go func() {
+			_ = os.Remove(stdout.Name())
+			ch <- struct{}{}
+		}()
+
+		err = Watch(context.Background(), stdout.Name(), stderr.Name(), time.Now(), func(Event) bool { return false })
+
+		assert.NilError(t, err)
+
+		<-ch
+	})
+}