Merge branch 'bugfix/fix_sniffer_bug_caused_by_mode_switch_v3.1' into 'release/v3.1'

Fix sniffer bug caused by mode switch (backport v3.1)

See merge request espressif/esp-idf!7693
This commit is contained in:
Jiang Jiang Jian
2020-02-27 14:33:23 +08:00