[openvpn] Fix shell compatibility and ensure QA compliance #572

- Updated shebang to /bin/bash to match script usage (function, [[ ]])
- Applied formatting fixes to satisfy QA checks
- Ensured script passes shell validation

Fixes #572

Author: Piyushkhobragade

images/common/utils.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 function init_conf {
 	default_psql_vars
@@ -236,8 +236,7 @@ function openvpn_config_checksum {
 }
 
 function openvpn_config_download {
-	curl --silent --retry 10 --retry-delay 5 --retry-max-time 300\
-		--insecure --output vpn.tar.gz \
+	curl --silent --retry 10 --retry-delay 5 --retry-max-time 300 --insecure --output vpn.tar.gz \
 		${API_INTERNAL}/controller/vpn/download-config/$UUID/?key=$KEY
 	curl --silent --insecure --output checksum \
 		${API_INTERNAL}/controller/vpn/checksum/$UUID/?key=$KEY
@@ -255,7 +254,7 @@ function openvpn_config_download {
 
 function crl_download {
 	curl --silent --insecure --output revoked.crl \
-	${DASHBOARD_INTERNAL}/admin/pki/ca/x509/ca/${CA_UUID}.crl
+		${DASHBOARD_INTERNAL}/admin/pki/ca/x509/ca/${CA_UUID}.crl
 }
 
 function init_send_network_topology {