Latest dev-tools revision breaks tests

[dobey]

The latest ubuntuone-dev-tools revision introduces the use of unicode_literals in ubuntuone.devtools.runners and thus causes the override of $HOME to be a unicode object instead of str (bytes) in python2. In ubuntuone-client this now results in the following error:

  ModifySharesSubscriptionTests
    test_subscribe_share ... Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1039, in _inlineCallbacks
    result = g.send(result)
  File "/build/buildd/ubuntuone-client-4.1+r1290/contrib/testing/testcase.py", line 409, in setUp
    config.get_user_config(config_file=self.config_file)
  File "/build/buildd/ubuntuone-client-4.1+r1290/ubuntuone/syncdaemon/config.py", line 197, in get_user_config
    _user_config = _Config(config_file, config_files)
  File "/build/buildd/ubuntuone-client-4.1+r1290/ubuntuone/syncdaemon/config.py", line 289, in __init__
    self.default = self._load_defaults(config_files)
  File "/build/buildd/ubuntuone-client-4.1+r1290/ubuntuone/syncdaemon/config.py", line 301, in _load_defaults
    cp.parse_all()
  File "/build/buildd/ubuntuone-client-4.1+r1290/ubuntuone/syncdaemon/config.py", line 234, in parse_all
    super(SyncDaemonConfigParser, self).parse_all()
  File "/usr/lib/pymodules/python2.7/configglue/inischema/attributed.py", line 65, in parse_all
    self.parse(section, option)
  File "/usr/lib/pymodules/python2.7/configglue/inischema/typed.py", line 92, in parse
    value.value = value.parser(value.value, *args)
  File "/build/buildd/ubuntuone-client-4.1+r1290/ubuntuone/syncdaemon/config.py", line 103, in home_dir_parser
    result = expand_user(path)
  File "/build/buildd/ubuntuone-client-4.1+r1290/ubuntuone/platform/__init__.py", line 66, in expand_user
    assert isinstance(result, str)
exceptions.AssertionError:

There is actually a small issue in ubuntuone-client's default test case as well which makes this more of an issue, so I am reporting it in both places.