[COMMON] Change import-custom-cert from bash to sh

As part of removing GPLv3 license, policy components have moved from
bash to sh. This change is required in import-custom-certs script so
that custom certificates can be imported into components that try to
import them. Without this change, the init containers of the
components will just fail.

Change-Id: I6c5028428d4cd7c8baf3e96cb16a3cd91db57f9e
Issue-ID: POLICY-3232
Signed-off-by: a.sreekumar <ajith.sreekumar@bell.ca>
diff --git a/kubernetes/common/cert-wrapper/resources/import-custom-certs.sh b/kubernetes/common/cert-wrapper/resources/import-custom-certs.sh
index cb4153e..6df7505 100755
--- a/kubernetes/common/cert-wrapper/resources/import-custom-certs.sh
+++ b/kubernetes/common/cert-wrapper/resources/import-custom-certs.sh
@@ -1,7 +1,7 @@
-#!/bin/bash
+#!/bin/sh
 {{/*
 
-# Copyright © 2020 Bell Canada
+# Copyright © 2020-2021 Bell Canada
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.