Revert ESP-MQTT (#508)

* Revert ESP-MQTT

* Revert ESP-MQTT

* Update sdkconfig.defaults

lib/espMqttClient/CMakeLists.txt

@@ -0,0 +1,8 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+SET(SDKCONFIG ${CMAKE_BINARY_DIR}/sdkconfig)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(simple-esp32-idf)