Pin openstacksdk for python 2.7

Related-Prod: PROD-3456
Change-Id: I729036f53d9b45092eaf9438d214fbb12e1a8617
diff --git a/src/com/mirantis/mk/Openstack.groovy b/src/com/mirantis/mk/Openstack.groovy
index a57256a..4ae71ac 100644
--- a/src/com/mirantis/mk/Openstack.groovy
+++ b/src/com/mirantis/mk/Openstack.groovy
@@ -61,6 +61,7 @@
         // NOTE: pin client packages to current latest to prevent
         // downloading packages which are not support Python 2.7
         'python-openstackclient==4.0.0',
+        'openstacksdk<0.44.0',
         'python-octaviaclient==1.11.0',
         'python-heatclient==1.18.0',
         'docutils==0.16'