Some misc fixes #4

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8 errors

Error return value of `doctor.DoCheckUp` is not checked (errcheck)

S1024: should use time.Until instead of t.Sub(time.Now()) (gosimple)

S1038: should use infoLogger.Printf(...) instead of infoLogger.Println(fmt.Sprintf(...)) (gosimple)

S1038: should use infoLogger.Fatalf(...) instead of infoLogger.Fatalln(fmt.Sprintf(...)) (gosimple)

S1012: should use `time.Since` instead of `time.Now().Sub` (gosimple)

S1012: should use `time.Since` instead of `time.Now().Sub` (gosimple)

S1012: should use `time.Since` instead of `time.Now().Sub` (gosimple)

issues found