Fix ci for python 2

Change-Id: I3402c3511f5b1850e4ce216cec84c243d6c5c3ba
Related-Prod: PRODX-3456
(cherry picked from commit e7c786157a1abebc204da7fa32683b14cf4276ff)
diff --git a/src/com/mirantis/mk/Openstack.groovy b/src/com/mirantis/mk/Openstack.groovy
index 98df398..0a55867 100644
--- a/src/com/mirantis/mk/Openstack.groovy
+++ b/src/com/mirantis/mk/Openstack.groovy
@@ -58,7 +58,8 @@
         // downloading packages which are not support Python 2.7
         'python-openstackclient==4.0.0',
         'python-heatclient==1.18.0',
-        'docutils==0.16'
+        'docutils==0.16',
+        'pyrsistent<0.17.1',
     ]
 
     if (version == 'kilo') {