ESP8266 connect fixes (#605)

* ESP8266 Connection Fixes

* Update client.py

* Update mqtt_client.cpp

* Update mqtt_client.cpp

* Fix ping

* Async dump config

* Update base image to 1.7.0

* Update helpers.py

* Updates

* Update Dockerfile.lint

esphome/components/api/api_server.cpp

@@ -712,12 +712,12 @@ bool APIConnection::send_buffer(APIMessageType type) {
   size_t needed_space = this->send_buffer_.size() + header_len;
 
   if (needed_space > this->client_->space()) {
-    delay(5);
+    delay(0);
     if (needed_space > this->client_->space()) {
       if (type != APIMessageType::SUBSCRIBE_LOGS_RESPONSE) {
         ESP_LOGV(TAG, "Cannot send message because of TCP buffer space");
       }
-      delay(5);
+      delay(0);
       return false;
     }
   }