Always install docutils in venv

Docutils are mandatory but installed only when client version is kilo.
As result installing any other client will fail on docutils import.
This patch ensure we installed docutils to venv by calling
setupDocutilsVirtualenv()

Change-Id: I755d9bb47f04b597e510a48c59a680d65252ed58
diff --git a/src/com/mirantis/mk/Openstack.groovy b/src/com/mirantis/mk/Openstack.groovy
index 8236ff3..b261f03 100644
--- a/src/com/mirantis/mk/Openstack.groovy
+++ b/src/com/mirantis/mk/Openstack.groovy
@@ -24,6 +24,7 @@
 
 def setupOpenstackVirtualenv(path, version = 'kilo') {
     def python = new com.mirantis.mk.Python()
+    python.setupDocutilsVirtualenv(path)
 
     def openstack_kilo_packages = [
         'python-cinderclient>=1.3.1,<1.4.0',
@@ -38,7 +39,6 @@
         'oslo.i18n>=2.3.0,<2.4.0',
         'oslo.serialization>=1.8.0,<1.9.0',
         'oslo.utils>=1.4.0,<1.5.0',
-        'docutils>=0.12'
     ]
 
     def openstack_latest_packages = [