switch back to master branch for docker_engine role

molecule/centos7/converge.yml

@@ -1,10 +1,13 @@
 ---
 - name: Converge
   hosts: all
+  environment:
+    PYTHONPATH: /opt/python2/ansible-deps/lib/python2.7/site-packages
   vars:
     dockerengine_packages_extra:
       - epel-release
       - python-pip
+      - python-virtualenv
     dockerengine_networks:
       - name: droneci_default
     droneci_runner_docker_service_stopped: True

molecule/centos7/requirements.yml

@@ -2,4 +2,4 @@
 - src: https://gitea.rknet.org/ansible/xoxys.docker_engine.git
   name: xoxys.docker_engine
   scm: git
-  version: refactoring
+  version: master