Need to add option for message exactly match in class MessageSystemCallItem in device/system_call_manager.py

[qilinkang]

The message check In method invoke() is:

match = re.search(self.expect, response)

    if match is None:
        self.log_match_failure(response)
        return

For Thread traffic test cases we need to add exactly match check between the sending and received data .

[Colin Tan]

Some commands append EOL char to output. Should we do rstrip() to remove spaces and \n?

[qilinkang]

Doing rstrip() looks good.