[py3] Fixed conditional_processing tests

from __future__ import unicode_literals

import calendar

import datetime

import re

    if not etags:

        # etag_str has wrong format, treat it as an opaque string then

        return [etag_str]

    etags = [e.decode('string_escape') for e in etags]

    etags = [e.encode('ascii').decode('unicode_escape') for e in etags]

    return etags

def quote_etag(etag):

    def assertFullResponse(self, response, check_last_modified=True, check_etag=True):

        self.assertEqual(response.status_code, 200)

        self.assertEqual(response.content, FULL_RESPONSE)

        self.assertEqual(response.content, FULL_RESPONSE.encode())

        if check_last_modified:

            self.assertEqual(response['Last-Modified'], LAST_MODIFIED_STR)

        if check_etag: