Try to use another escaping for pepper json

Change-Id: I7dfeefe0dee41edf844f1285f027db37a06a52f2
diff --git a/src/com/mirantis/mk/Salt.groovy b/src/com/mirantis/mk/Salt.groovy
index 00c8340..27a5f0b 100644
--- a/src/com/mirantis/mk/Salt.groovy
+++ b/src/com/mirantis/mk/Salt.groovy
@@ -680,7 +680,7 @@
         writeFile file: pepperCmdFile, text: dataStr
         pepperCmd = "pepper -c ${venv}/pepperrc --make-token -x ${venv}/.peppercache --json-file ${pepperCmdFile}"
     } else {
-        pepperCmd = "pepper -c ${venv}/pepperrc --make-token -x ${venv}/.peppercache --json \\\"" + dataStr.replaceAll('"', '\\\\\\\\\\\\\"') + "\\\"" // yeah, really 13 backslashes, don't ask why
+        pepperCmd = "pepper -c ${venv}/pepperrc --make-token -x ${venv}/.peppercache --json \"" + dataStr.replaceAll('"', '\\\\\\\"') + "\"" // yeah, really 7 backslashes, don't ask why
     }
 
     if (venv) {