Sometimes `^C` will generate huge "shutting down" logs during integration test

[wxiaoguang]

    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...
    testlogger.go:78: 2022/06/11 20:14:36 ...eful/manager_unix.go:158:handleSignals() [W] PID: 13381. Background context for manager closed - context canceled - Shutting down...