Address test failures

More details about the fix to the testDuration failure (regression):

```
FAIL: testDuration (whipper.test.test_image_toc.CapitalMergeTestCase)
testDuration
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/twisted/internet/defer.py", line 151, in maybeDeferred
    result = f(*args, **kw)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/twisted/internet/utils.py", line 221, in runWithWarningsSuppressed
    reraise(exc_info[1], exc_info[2])
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/twisted/python/compat.py", line 464, in reraise
    raise exception.with_traceback(traceback)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/twisted/internet/utils.py", line 217, in runWithWarningsSuppressed
    result = f(*a, **kw)
  File "/home/travis/build/whipper-team/whipper/whipper/test/test_image_toc.py", line 271, in testDuration
    self.assertEqual(self.table.getFrameLength(), 173530)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/twisted/trial/_synctest.py", line 432, in assertEqual
    super(_Assertions, self).assertEqual(first, second, msg)
  File "/opt/python/3.5.6/lib/python3.5/unittest/case.py", line 829, in assertEqual
    assertion_func(first, second, msg=msg)
  File "/opt/python/3.5.6/lib/python3.5/unittest/case.py", line 822, in _baseAssertEqual
    raise self.failureException(msg)
twisted.trial.unittest.FailTest: 184930 != 173530
```

The test fails because if either nextTrack.session or thisTrack.session are None the if is false and the instructions inside it aren't executed. The check for None is needed because Python 3 doesn't allow NoneType comparisons (in Python 2 that was possible).
IIRC correctly in that test nextTrack.session has value 2 while thisTrack.session is None. That means the Python 2 version evaluates the if condition to true, while the Python 3 version in the first commit does not.
With this change both of the values of nextTrack.session and thisTrack.session are compared as int (if None, the value 1 is used for the comparison - as in disc session 1).

Regression introduced in 64dd9d843a.

Signed-off-by: JoeLametta <JoeLametta@users.noreply.github.com>

whipper/common/accurip.py

@@ -193,7 +193,8 @@ def _match_responses(tracks, responses):
         for i, track in enumerate(tracks):
             for v in ('v1', 'v2'):
                 if track.AR[v]['CRC'] == r.checksums[i]:
-                    if r.confidences[i] > track.AR[v]['DBConfidence']:
+                    if (track.AR[v]['DBConfidence'] is None or
+                            r.confidences[i] > track.AR[v]['DBConfidence']):
                         track.AR[v]['DBCRC'] = r.checksums[i]
                         track.AR[v]['DBConfidence'] = r.confidences[i]
                         logger.debug(
@@ -242,7 +243,8 @@ def print_report(result):
                     track.AR['v2']['DBCRC']
                 ) if _f])
             max_conf = max(
-                [track.AR[v]['DBConfidence'] for v in ('v1', 'v2')]
+                [track.AR[v]['DBConfidence'] for v in ('v1', 'v2')
+                 if track.AR[v]['DBConfidence'] is not None], default=None
             )
             if max_conf:
                 if max_conf < track.AR['DBMaxConfidence']:

whipper/common/cache.py

@@ -98,7 +98,7 @@ class Persister:
         if not os.path.exists(self._path):
             return
 
-        handle = open(self._path)
+        handle = open(self._path, 'rb')
         import pickle
 
         try:

whipper/common/config.py

@@ -44,7 +44,7 @@ class Config:
         # Open the file with the correct encoding
         if os.path.exists(self._path):
             with codecs.open(self._path, 'r', encoding='utf-8') as f:
-                self._parser.readfp(f)
+                self._parser.read_file(f)
 
         logger.debug('loaded %d sections from config file',
                      len(self._parser.sections()))

whipper/common/renamer.py

@@ -91,7 +91,7 @@ class Operator:
         Execute the operations
         """
 
-    def next(self):
+    def __next__(self):
         operation = self._todo[len(self._done)]
         if self._resuming:
             operation.redo()
@@ -199,7 +199,8 @@ class RenameInFile(Operation):
             (fd, name) = tempfile.mkstemp(suffix='.whipper')
 
             for s in handle:
-                os.write(fd, s.replace(self._source, self._destination))
+                os.write(fd,
+                         s.replace(self._source, self._destination).encode())
 
             os.close(fd)
             os.rename(name, self._path)