RobotError: Don't call __init__() supermethod

First of all, the change introduced in
330ce55 is not PEP8-compliant (too long
line) and also I think it's a bit odd to call the __init__() method of
Exception *without* giving it a status attribute and then setting it in
our own __init__().

Setting self.message and self.status directly is also documented in the
official Python documentation, so we don't rely on internals here as
well, see:

https://docs.python.org/3/tutorial/errors.html#user-defined-exceptions

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

hetzner/__init__.py

@@ -1,7 +1,9 @@
 class RobotError(Exception):
     def __init__(self, message, status=None):
-        formattedMessage = message if status is None else "{0} ({1})".format(message, status)
-        super(Exception, self).__init__(formattedMessage)
+        if status is None:
+            self.message = message
+        else:
+            self.message = "{0} ({1})".format(message, status)
         self.status = status