[docker-image-scanner] Additionaly escape new line character

Change-Id: Ie72e16656757489f6568bf58b8766e28cc2b4985
Related-PROD: https://mirantis.jira.com/browse/RE-435
diff --git a/src/com/mirantis/mk/DockerImageScanner.groovy b/src/com/mirantis/mk/DockerImageScanner.groovy
index 69fc25c..6bab04c 100644
--- a/src/com/mirantis/mk/DockerImageScanner.groovy
+++ b/src/com/mirantis/mk/DockerImageScanner.groovy
@@ -195,13 +195,13 @@
                 jiraNamespace = 'PRODX'
             }
             jira_summary = "[${image_key}] Found CVEs in Docker image"
-            jira_description = "${image.key}\n"
+            jira_description = "${image.key}\\n"
             image.value.each{
                 pkg ->
-                    jira_description += "__* ${pkg.key}\n"
+                    jira_description += "__* ${pkg.key}\\n"
                     pkg.value.each{
                         cve ->
-                            jira_description += "________${cve}\n"
+                            jira_description += "________${cve}\\n"
                     }
             }