Fix/env vars rest dial (#1225)

* rest dial needs to support env vars

* wip

lib/middleware.js

@@ -424,8 +424,8 @@ module.exports = function(srf, logger) {
             logger.info(`Setting env_vars: ${Object.keys(d_env_vars)}`); // Only log the keys not the values
             env_vars = d_env_vars;
           }
-        } catch (error) {
-          logger.info('Unable to set env_vars', error);
+        } catch (err) {
+          logger.info({err}, 'Unable to set env_vars');
         }
         const params = Object.assign(['POST', 'WS'].includes(app.call_hook.method) ? { sip: req.msg } : {},
           req.locals.callInfo,