Disable voicemail feature if voicemail is disabled globaly

etc/admin.conf

@@ -3,7 +3,11 @@
         log4perlconf="/etc/ngcp-ossbss/logging.conf"
         billing_features="[% www_admin.billing_features %]"
         peering_features="[% www_admin.peering_features %]"
+	[% IF asterisk.voicemail.enable == "yes" %]
         voicemail_features="[% www_admin.voicemail_features %]"
+	[% ELSE %]
+        voicemail_features="0"
+	[% END %]
         fax_features="[% www_admin.fax_features %]"
         conference_features="[% www_admin.conference_features %]"
         customer_features="0"