Use venv/bin/activate to apply the monkey_patch

Author: cognifloyd

.circleci/config.yml

@@ -35,9 +35,8 @@ jobs:
             tests/setup_testing_env.sh
             set -x
             which nosetests
-            # eventlet monkey_patch as early as possible
-            sed -i -e '/^import re$/i from st2common.util.monkey_patch import monkey_patch\nmonkey_patch()' $(which nosetests)
-            head -n5 $(which nosetests)
+            # eventlet monkey_patch as early as possible (has to be in activate as nosetests gets reinstalled during test phase)
+            echo "grep -q monkey_patch $(which nosetests) || sed -i -e '/^import re$/i from st2common.util.monkey_patch import monkey_patch\nmonkey_patch()' $(which nosetests)" >> ~/virtualenv/bin/activate
       - run:
           name: Run tests (Python 3.6)
           # NOTE: We don't want to use default "-e" option because this means