Remove last of homegrown Mock object

using mock.Mock everywhere now

epu/provisioner/test/util.py

@@ -13,9 +13,9 @@
 
 from libcloud.compute.base import NodeDriver, Node, NodeSize
 from libcloud.compute.types import NodeState
+from mock import Mock
 
 from epu.provisioner.ctx import ContextResource
-from epu.test import Mock
 from epu.states import InstanceState
 
 import dashi.bootstrap

epu/test/__init__.py

@@ -14,17 +14,6 @@
 log = logging.getLogger(__name__)
 
 
-class Mock(object):
-    def __init__(self, **kwargs):
-        self.__dict__.update(kwargs)
-
-    def __repr__(self):
-        return self.__str__()
-
-    def __str__(self):
-        return "Mock(" + ",".join("%s=%s" % (k, v) for k, v in self.__dict__.iteritems()) + ")"
-
-
 class MockLeader(object):
 
     def __init__(self):