Merge branch 'feature/mqtt_unit_test_cleanup' into 'master'

Reduce the includes used in files.

See merge request espressif/esp-mqtt!93

lib/include/mqtt_outbox.h

@@ -6,6 +6,7 @@
 #ifndef _MQTT_OUTOBX_H_
 #define _MQTT_OUTOBX_H_
 #include "platform.h"
+#include "esp_err.h"
 
 #ifdef  __cplusplus
 extern "C" {

lib/include/platform_esp32_idf.h

@@ -7,21 +7,9 @@
 #define _ESP_PLATFORM_H__
 
 #include "freertos/FreeRTOS.h"
-#include "freertos/task.h"
-#include "freertos/semphr.h"
-#include "freertos/queue.h"
 #include "freertos/event_groups.h"
 
-#include "lwip/err.h"
-#include "lwip/sockets.h"
-#include "lwip/sys.h"
-#include "lwip/netdb.h"
-#include "lwip/dns.h"
-
-#include "sys/queue.h"
-#include "esp_err.h"
-#include "esp_log.h"
-#include "esp_system.h"
+#include <sys/time.h>
 
 char *platform_create_id_string(void);
 int platform_random(int max);