esp_wifi: fix some WiFi bugs

Fix following WiFi bugs:
1. Fix crashing during shared WEP connection
2. Remove log "age_bss: null bss
3. Add WiFi stop checking at the beginning of wifi deinit api
4. Fix espnow crash
5. Fix the bug for setting channel when WiFi is no NULL mode
6. Adjust scheme percent when BT is in connected status
7. Fix WiFi stop leads to memory leak
8. Place the Vendor Specific Element at the end of WiFi packet

components/esp_wifi/src/wifi_init.c

@@ -115,6 +115,7 @@ esp_err_t esp_wifi_deinit(void)
     err = esp_wifi_deinit_internal();
     if (err != ESP_OK) {
         ESP_LOGE(TAG, "Failed to deinit Wi-Fi driver (0x%x)", err);
+        return err;
     }
 
 #if CONFIG_ESP_NETIF_TCPIP_ADAPTER_COMPATIBLE_LAYER