Remove "day" argument from log_match api of PTL
Day argument is redundant as log_match also contains starttime and endtime (epoch time) as arguments to search/match pattern.
As starttime and endtime provides day information, log_match can use this info to get log files to search/match accordingly.
After this chage log_match api will be:
def log_match(self, msg=None, id=None, n=50, tail=True, allmatch=False,
regexp=False, max_attempts=None, interval=None,
starttime=None, endtime=None, level=logging.INFO,
existence=True)