restructure error_check into no_error_found and error_found

[gouyang]

There are several negative testings which are expected to fail, which looks so bad in the test report, it would be better to turn them into GOOD result.

suggest to split error_check into no_error_found and error_found:
for normal testing, skip the error_found method, maybe add it into default config file is a good idea.
for negative testing, skip the no_error_found method when call OutputGood.

@staticmethod
def no_error_found(output):
    """
    Return False if Go panic string found in output

    :param output: Stripped output string
    :return: True if Go panic pattern **not** found
    """
    regex = re.compile(r'\s*panic:\s*.+error.*')
    for line in output.splitlines():
        if bool(regex.search(line.strip())):
            return False  # panic message found
    return True  # panic message not found

@staticmethod
def error_found(output):
    """
    Return True if Go panic string found in output

    :param output: Stripped output string
    :return: False if Go panic pattern **not** found
    """
    regex = re.compile(r'\s*panic:\s*.+error.*')
    for line in output.splitlines():
        if bool(regex.search(line.strip())):
            return True  # panic message found
    return False  # panic message not found

[gouyang]

apply to crash_check as well

[gouyang]

withdraw this at the moment