Set correct version of pepper for --json-file

Change-Id: I550a19ae7c3e13eb6944bf3d09bb77c1dbaec86b
diff --git a/src/com/mirantis/mk/Python.groovy b/src/com/mirantis/mk/Python.groovy
index 8a2cdf8..7440b06 100644
--- a/src/com/mirantis/mk/Python.groovy
+++ b/src/com/mirantis/mk/Python.groovy
@@ -311,7 +311,7 @@
     def common = new com.mirantis.mk.Common()
 
     // virtualenv setup
-    requirements = ['salt-pepper==0.5.*']
+    requirements = ['salt-pepper>=0.5.2']
     setupVirtualenv(path, 'python2', requirements, null, clean, true)
 
     // pepperrc creation