eventlet.monkey_patch upfront in __init__

Following best practice recommendations [1], monkey_patch in
congress/server/__init__.py,
congress/cfg_validator/agent/__init__.py,
and congress/tests/__init__.py (previously done)
 to ensure all modules are patched very first thing
and no unpatched modules get used.

All other uses of eventlet.monkey_patch are removed.

[1] https://specs.openstack.org/openstack/openstack-specs/specs/eventlet-best-practices.html

Change-Id: Id98f9f9a6f21ca56dd0c1facba6ca4ea064e9352

congress/cfg_validator/agent/__init__.py

@@ -0,0 +1,3 @@
+# NOTE(ekcs): monkey_patch upfront to ensure all imports get patched modules
+import eventlet
+eventlet.monkey_patch()

congress/dse2/control_bus.py

@@ -18,8 +18,6 @@ import json
 import time
 
 import eventlet
-eventlet.monkey_patch()
-
 from oslo_log import log as logging
 
 from congress.dse2 import data_service

congress/dse2/dse_node.py

@@ -16,10 +16,6 @@
 import json
 import six
 
-
-import eventlet
-eventlet.monkey_patch()  # for using oslo.messaging w/ eventlet executor
-
 from oslo_config import cfg
 from oslo_db import exception as db_exc
 from oslo_log import log as logging

congress/server/__init__.py

@@ -0,0 +1,3 @@
+# NOTE(ekcs): monkey_patch upfront to ensure all imports get patched modules
+import eventlet
+eventlet.monkey_patch()

congress/server/congress_server.py

@@ -21,8 +21,6 @@ from __future__ import absolute_import
 import socket
 import sys
 
-import eventlet
-eventlet.monkey_patch()
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_service import service

congress/tests/haht/test_congress_haht.py

@@ -29,9 +29,6 @@ import sys
 import tempfile
 import time
 
-# Note: monkey patch to allow running this test standalone under 'nose'
-import eventlet
-eventlet.monkey_patch()
 from oslo_log import log as logging
 import requests
 import six
@@ -119,7 +116,7 @@ class TestCongressHAHT(base.SqlTestCase):
             dir='/tmp')
 
         args = [sys.executable,
-                'congress/server/congress_server.py',
+                'bin/congress-server',
                 '--node-id',
                 'node_%d' % num,
                 '--api',