Is tmp_str in strlist, case insensitive.

def string_in_list(tmp_str, strlist):
        # type: (AnyStr, List[AnyStr]) -> bool
        """Is tmp_str in strlist, case insensitive."""
        new_str_list = strlist[:]
        for i, str_in_list in enumerate(new_str_list):
            new_str_list[i] = str_in_list.lower()
        return tmp_str.lower() in new_str_list