Fix the tempest gate by moving the monkey patch statements

The tempest will start a thread to run tempest, if we monkey patch the
libs without os in root dir of Mogan code tree, the tempest thread will
never be scheduled to run. This change distribute the monkey_patch
statements to mogan/cmd, mogan/tests/unit and mogan/tests/functional.

Closes-Bug: 1702822

Change-Id: I6300030539bb40ce839a508628dab4a68edf6676

mogan/__init__.py

@@ -1,22 +0,0 @@
-# Copyright 2016 Huawei Technologies Co.,LTD.
-# All Rights Reserved.
-
-# 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.
-
-import os
-
-os.environ['EVENTLET_NO_GREENDNS'] = 'yes'
-
-import eventlet
-
-eventlet.monkey_patch(os=False)

mogan/cmd/__init__.py

@@ -13,6 +13,14 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+
+import os
+
+os.environ['EVENTLET_NO_GREENDNS'] = 'yes'
+
+import eventlet
+
 import oslo_i18n as i18n
 
+eventlet.monkey_patch(os=False)
 i18n.install('mogan')

mogan/tests/functional/__init__.py

@@ -0,0 +1,17 @@
+# Copyright 2017 Huawei Technologies Co.,LTD.
+# All Rights Reserved.
+#
+# 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.
+import eventlet
+
+eventlet.monkey_patch(os=False)

mogan/tests/unit/__init__.py

@@ -20,9 +20,11 @@
 .. automodule:: mogan.tests.unit
    :platform: Unix
 """
+import eventlet
 
 from mogan import objects
 
+eventlet.monkey_patch(os=False)
 # NOTE(Shaohe Feng): Make sure we have all of the objects loaded. We do this
 # at module import time, because we may be using mock decorators in our
 # tests that run at import time.