add copyright statements

Signed-off-by: Anubhab Majumdar <[email protected]>

cmd/hubble/cells_linux.go

@@ -1,5 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
+// Copyright Authors of Cilium.
+// Modified by Authors of Retina.
 package hubble
 
 import (

cmd/hubble/daemon_linux.go

@@ -1,3 +1,7 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+// Copyright Authors of Cilium.
+// Modified by Authors of Retina.
 package hubble
 
 import (

cmd/hubble/daemon_main_linux.go

@@ -1,9 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
-
+// Copyright Authors of Cilium.
+// Modified by Authors of Retina.
 // This bootstraps Hubble control plane.
-// Inspired by Cilium's daemon_main.go.
-
 package hubble
 
 import (