Enforced exact version of salt-pepper during creating pepper venv

Change-Id: I88ae18f9b8530228f689475687258f5459c95ad0
diff --git a/src/com/mirantis/mk/Python.groovy b/src/com/mirantis/mk/Python.groovy
index 0200e52..2b51681 100644
--- a/src/com/mirantis/mk/Python.groovy
+++ b/src/com/mirantis/mk/Python.groovy
@@ -305,8 +305,7 @@
     def common = new com.mirantis.mk.Common()
 
     // virtualenv setup
-    // TODO: once pepper changes are in pypi, reenable these lines
-    requirements = ['salt-pepper']
+    requirements = ['salt-pepper==0.5.2']
     setupVirtualenv(path, 'python2', requirements, null, clean, true)
 
     // pepperrc creation