fix(connection config): remove keepAliveInitialDelay default value (#2712)

Author: niels-van-den-broeck

lib/connection_config.js

@@ -118,7 +118,7 @@ class ConnectionConfig {
     this.trace = options.trace !== false;
     this.stringifyObjects = options.stringifyObjects || false;
     this.enableKeepAlive = options.enableKeepAlive !== false;
-    this.keepAliveInitialDelay = options.keepAliveInitialDelay || 0;
+    this.keepAliveInitialDelay = options.keepAliveInitialDelay;
     if (
       options.timezone &&
       !/^(?:local|Z|[ +-]\d\d:\d\d)$/.test(options.timezone)