tests: stable test_node_callback_when_destroyed (#3852)
tests: stable test_node_callback_when_destroyed (#3852)

Signed-off-by: Neil Shen <cce998fdf3749d1bb26a297634a107d1dc0875fa@gmail.com>
BusyJay/tikv,c4pt0r/tikv,pingcap/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv