Update traceback to log file, if LDTP_DEBUG_FILE environment variable is set
Update traceback to log file, if LDTP_DEBUG_FILE environment variable is set

MichalPokorny/ldtp2,freedesktop-unofficial-mirror/ldtp__ldtp2,MichalPokorny/ldtp2,MichalPokorny/ldtp2,ldtp/ldtp2,ldtp/ldtp2,freedesktop-unofficial-mirror/ldtp__ldtp2,freedesktop-unofficial-mirror/ldtp__ldtp2,ldtp/ldtp2,ldtp/ldtp2,ldtp/ldtp2,freedesktop-unofficial-mirror/ldtp__ldtp2,MichalPokorny/ldtp2,MichalPokorny/ldtp2,freedesktop-unofficial-mirror/ldtp__ldtp2