wrap newlines in json output

Change-Id: If5aefb25a89299ac8c6ad544b2879bd75e78c9af
diff --git a/src/com/mirantis/mk/Salt.groovy b/src/com/mirantis/mk/Salt.groovy
index c8deeeb..710d4a6 100644
--- a/src/com/mirantis/mk/Salt.groovy
+++ b/src/com/mirantis/mk/Salt.groovy
@@ -214,7 +214,7 @@
     for (node in out) {
         if (node.value) {
             println "Node ${node.key} changes:"
-            print new groovy.json.JsonBuilder(node.value).toPrettyString().replaceAll('\\n', '<br>\\n')
+            print new groovy.json.JsonBuilder(node.value).toPrettyString().replace('\\n', System.getProperty('line.separator'))
         } else {
             println "No changes for node ${node.key}"
         }