Merge branch 'feature/add_support_for_signal_test_v3.3' into 'release/v3.3'

esp32: add support for WiFi signal test (backport v3.3)

See merge request idf/esp-idf!4759
This commit is contained in:
Jiang Jiang Jian
2019-04-15 17:52:54 +08:00