move the integrated tests into the functional tree

This moves the integrated tests into the functional tree as an initial
seed for the functional tests. It was agreed to as an early step at
the design summit. Work on cleaning these up will happen after the
move.

PYTHON_HASH_SEED=0 is needed because these tests apparently remain
order dependent.

Also remove the use of test.ReplaceModule, which is an untested
mocking system in the nova tree that doesn't seem to reliably
work. Use stubs instead for the time being, as this will ensure
repeatability of the code.

Part of bp:functional-tests-for-nova

Change-Id: I742c487dd7bca9de3e811c545de477367fff112c

nova/tests/functional/__init__.py

@@ -0,0 +1,47 @@
+#    Copyright (c) 2011 Justin Santa Barbara
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+"""
+:mod:`functional` -- Nova functional tests
+=====================================================
+
+.. automodule:: nova.tests.functional
+   :platform: Unix
+"""
+
+# TODO(mikal): move eventlet imports to nova.__init__ once we move to PBR
+import os
+import sys
+import traceback
+
+
+# NOTE(mikal): All of this is because if dnspython is present in your
+# environment then eventlet monkeypatches socket.getaddrinfo() with an
+# implementation which doesn't work for IPv6. What we're checking here is
+# that the magic environment variable was set when the import happened.
+# NOTE(dims): Prevent this code from kicking in under docs generation
+# as it leads to spurious errors/warning.
+stack = traceback.extract_stack()
+if ('eventlet' in sys.modules and
+    os.environ.get('EVENTLET_NO_GREENDNS', '').lower() != 'yes' and
+    (len(stack) < 2 or 'sphinx' not in stack[-2][0])):
+    raise ImportError('eventlet imported before nova/cmd/__init__ '
+                      '(env var set to %s)'
+                      % os.environ.get('EVENTLET_NO_GREENDNS'))
+
+os.environ['EVENTLET_NO_GREENDNS'] = 'yes'
+
+import eventlet
+
+eventlet.monkey_patch(os=False)