Merge branch 'bugfix/github_small_fixes' into 'master'

Merge small bugfix PRs from github

* https://github.com/espressif/esp-idf/pull/389
* https://github.com/espressif/esp-idf/pull/382
* https://github.com/espressif/esp-idf/pull/367
* https://github.com/espressif/esp-idf/pull/366
* https://github.com/espressif/esp-idf/pull/361
* https://github.com/espressif/esp-idf/pull/355
* https://github.com/espressif/esp-idf/pull/350
* https://github.com/espressif/esp-idf/pull/348
* https://github.com/espressif/esp-idf/pull/339
* https://github.com/espressif/esp-idf/pull/46
* https://github.com/espressif/esp-idf/pull/307

See merge request !541

diff --cc components/tcpip_adapter/tcpip_adapter_lwip.c
Simple merge