Fix RHEL-7 test Packer image
- zerodisk.sh was removed in the recent fix to support RHEL6
- base image JSON was updated, but not the test image version
diff --git a/packer/test-rhel-7.json b/packer/test-rhel-7.json
index 7ca6705..2b16e5d 100644
--- a/packer/test-rhel-7.json
+++ b/packer/test-rhel-7.json
@@ -90,9 +90,8 @@
       "type":"shell",
       "execute_command":"{{.Vars}} sudo -E -S bash '{{.Path}}'",
       "scripts":[
-        "rhel/cleanup.sh",
-        "rhel/zerodisk.sh"
+        "rhel/cleanup.sh"
       ]
     }
   ]
-}
\ No newline at end of file
+}