Eventlet monkey patching should be as early as possible

We were seeing infinite recursion opening an ssl socket when running
various combinations of python3, eventlet, and urllib3. It is not
clear exactly what combination of versions are affected, but for
background there is an example of this issue documented here:

https://github.com/eventlet/eventlet/issues/371

(Commit message copied in part from nova commit
3c5e2b0e9fac985294a949852bb8c83d4ed77e04)

Change-Id: I76fed9e80a7f848a0f6b37c25dd035844c75a6ee

murano/cmd/__init__.py

@@ -0,0 +1,14 @@
+#
+#    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 murano.monkey_patch  # noqa

murano/cmd/api.py

@@ -18,8 +18,6 @@
 import os
 import sys
 
-import eventlet
-
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_log import log as logging
@@ -36,13 +34,6 @@ from murano.common import wsgi
 CONF = cfg.CONF
 
 
-if os.name == 'nt':
-    # eventlet monkey patching causes subprocess.Popen to fail on Windows
-    # when using pipes due to missing non blocking I/O support
-    eventlet.monkey_patch(os=False)
-else:
-    eventlet.monkey_patch()
-
 # If ../murano/__init__.py exists, add ../ to Python search path, so that
 # it will override what happens to be installed in /usr/(local/)lib/python...
 root = os.path.join(os.path.abspath(__file__), os.pardir, os.pardir, os.pardir)

murano/cmd/cfapi.py

@@ -17,8 +17,6 @@
 import os
 import sys
 
-import eventlet
-
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_service import service
@@ -32,13 +30,6 @@ from murano.common import wsgi
 CONF = cfg.CONF
 
 
-if os.name == 'nt':
-    # eventlet monkey patching causes subprocess.Popen to fail on Windows
-    # when using pipes due to missing non blocking I/O support
-    eventlet.monkey_patch(os=False)
-else:
-    eventlet.monkey_patch()
-
 # If ../murano/__init__.py exists, add ../ to Python search path, so that
 # it will override what happens to be installed in /usr/(local/)lib/python...
 root = os.path.join(os.path.abspath(__file__), os.pardir, os.pardir, os.pardir)

murano/cmd/engine.py

@@ -17,8 +17,6 @@
 import os
 import sys
 
-import eventlet
-
 from oslo_concurrency import processutils
 from oslo_log import log as logging
 from oslo_service import service
@@ -29,13 +27,6 @@ from murano.common import engine
 CONF = config.CONF
 
 
-if os.name == 'nt':
-    # eventlet monkey patching causes subprocess.Popen to fail on Windows
-    # when using pipes due to missing non blocking I/O support
-    eventlet.monkey_patch(os=False)
-else:
-    eventlet.monkey_patch()
-
 # If ../murano/__init__.py exists, add ../ to Python search path, so that
 # it will override what happens to be installed in /usr/(local/)lib/python...
 root = os.path.join(os.path.abspath(__file__), os.pardir, os.pardir, os.pardir)

murano/monkey_patch.py

@@ -0,0 +1,25 @@
+#
+#    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
+
+import eventlet
+
+
+if os.name == 'nt':
+    # eventlet monkey patching causes subprocess.Popen to fail on Windows
+    # when using pipes due to missing non blocking I/O support
+    eventlet.monkey_patch(os=False)
+else:
+    eventlet.monkey_patch()