Support python 3

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

tests/unit/log_printer_test.py

@@ -3,6 +3,8 @@ from __future__ import unicode_literals
 
 import os
 
+import six
+
 from .. import unittest
 from compose.cli.log_printer import LogPrinter
 
@@ -30,16 +32,17 @@ class LogPrinterTest(unittest.TestCase):
         output = self.get_default_output()
         self.assertIn('\033[', output)
 
+    @unittest.skipIf(six.PY3, "Only test unicode in python2")
     def test_unicode(self):
-        glyph = u'\u2022'.encode('utf-8')
+        glyph = u'\u2022'
 
         def reader(*args, **kwargs):
-            yield glyph + b'\n'
+            yield glyph + '\n'
 
         container = MockContainer(reader)
         output = run_log_printer([container])
 
-        self.assertIn(glyph, output)
+        self.assertIn(glyph, output.decode('utf-8'))
 
 
 def run_log_printer(containers, monochrome=False):