adjusting _seup_supervisor to not restart when wrong log-level given

target/scripts/startup/setup-stack.sh

@@ -14,25 +14,27 @@ function _setup_supervisor
   if ! grep -q "loglevel = ${SUPERVISOR_LOGLEVEL}" /etc/supervisor/supervisord.conf
   then
     case "${SUPERVISOR_LOGLEVEL}" in
-      'critical' | 'error' | 'warn' | 'info' | 'debug' )
+      'critical' | 'error' | 'info' | 'debug' )
         sed -i -E \
-          "s|loglevel.*|loglevel = ${SUPERVISOR_LOGLEVEL}|g" \
+          "s|(loglevel).*|\1 = ${SUPERVISOR_LOGLEVEL}|g" \
           /etc/supervisor/supervisord.conf
+
+        supervisorctl reload
+        ;;
+
+      'warn' )
+        return 0
         ;;
 
       * )
         _notify 'err' \
-          "SUPERVISOR_LOGLEVEL value '${SUPERVISOR_LOGLEVEL}' unknown. Defaulting to 'warn'"
-
-        sed -i -E \
-          's|loglevel.*|loglevel = warn|g' \
-          /etc/supervisor/supervisord.conf
+          "SUPERVISOR_LOGLEVEL '${SUPERVISOR_LOGLEVEL}' unknown. Using default 'warn'"
         ;;
 
     esac
-
-    supervisorctl reload
   fi
+
+  return 0
 }
 
 function _setup_default_vars