Finish dropping Python 2.6 and 3.3 support

* Undo letsencrypt-auto changes

* Remove ordereddict import

* Add Python 3.4 tests to replace 3.3

* Add python_requires

* update pipstrap

certbot/plugins/disco.py

@@ -5,6 +5,8 @@ import logging
 import pkg_resources
 import six
 
+from collections import OrderedDict
+
 import zope.interface
 import zope.interface.verify
 
@@ -12,12 +14,6 @@ from certbot import constants
 from certbot import errors
 from certbot import interfaces
 
-try:
-    from collections import OrderedDict
-except ImportError:  # pragma: no cover
-    # OrderedDict was added in Python 2.7
-    from ordereddict import OrderedDict  # pylint: disable=import-error
-
 
 logger = logging.getLogger(__name__)