Fix typo in Pepper related changes

- Fix typo in changes which inforcing to use Pepper
  instead of direct http requests.

Change-Id: I34a689d8c89b68b8a5cfa77a96bdfb2a1132d7f6
Closes-Bug: PROD-15207
diff --git a/update-package.groovy b/update-package.groovy
index 552a361..c71f598 100644
--- a/update-package.groovy
+++ b/update-package.groovy
@@ -30,7 +30,7 @@
     try {
 
         stage('Setup virtualenv for Pepper') {
-            python.setupPepperVirtualenv(venvPepper, SALT_MASTER_URL, SALT_MASTER_CREDENTIALS)
+            python.setupPepperVirtualenv(pepperEnv, SALT_MASTER_URL, SALT_MASTER_CREDENTIALS)
         }
 
         stage('List target servers') {