Define logger in upgrade_crc_check_chance_test.py

[cclauss]

Resolves undefined names on lines 105, 111, 127, 132, 135, 137, 140, 145, and 147

flake8 testing of https://github.com/apache/cassandra-dtest on Python 3.6.3

$ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

./auth_join_ring_false_test.py:188:13: F821 undefined name 'assert_regexp_matches'
            assert_regexp_matches(repr(cm._excinfo[1]), message)
            ^
./upgrade_crc_check_chance_test.py:101:9: F821 undefined name 'logger'
        logger.debug('Test completed successfully')
        ^
./upgrade_crc_check_chance_test.py:107:9: F821 undefined name 'logger'
        logger.debug(meta.options['compression_parameters'])
        ^
./upgrade_crc_check_chance_test.py:123:9: F821 undefined name 'logger'
        logger.debug('Upgrading node {node} to {tag}'.format(**format_args))
        ^
./upgrade_crc_check_chance_test.py:128:9: F821 undefined name 'logger'
        logger.debug('{node} stopped'.format(**format_args))
        ^
./upgrade_crc_check_chance_test.py:131:9: F821 undefined name 'logger'
        logger.debug('Updating version to tag {tag}'.format(**format_args))
        ^
./upgrade_crc_check_chance_test.py:133:9: F821 undefined name 'logger'
        logger.debug('Set new cassandra dir for {node}: {tag}'.format(**format_args))
        ^
./upgrade_crc_check_chance_test.py:136:9: F821 undefined name 'logger'
        logger.debug('Starting {node} on new version ({tag})'.format(**format_args))
        ^
./upgrade_crc_check_chance_test.py:141:9: F821 undefined name 'logger'
        logger.debug('Running upgradesstables')
        ^
./upgrade_crc_check_chance_test.py:143:9: F821 undefined name 'logger'
        logger.debug('Upgrade of {node} complete'.format(**format_args))
        ^
10    F821 undefined name 'assert_regexp_matches'
10