Salt: fix pepper call

Change-Id: I548f13f4654aa7e29a0f5a7d2e34be3c8bffc566
diff --git a/src/com/mirantis/mk/Salt.groovy b/src/com/mirantis/mk/Salt.groovy
index 2809294..c5f03d6 100644
--- a/src/com/mirantis/mk/Salt.groovy
+++ b/src/com/mirantis/mk/Salt.groovy
@@ -662,7 +662,7 @@
     def python = new com.mirantis.mk.Python()
     def dataStr = new groovy.json.JsonBuilder(data).toString()
 
-    def pepperCmd = "pepper -c ${venv}/pepperrc --make-token -x ${venv} --json \'${dataStr}\'"
+    def pepperCmd = "pepper -c ${venv}/pepperrc --make-token -x ${venv}/.peppercache --json \'${dataStr}\'"
 
     if (venv) {
         output = python.runVirtualenvCommand(venv, pepperCmd)