Update mirror-image

  * Allign to offline-build example

Change-Id: I96448007b75ef98dd8f658b0be14c0b56c8117ba
diff --git a/Jenkinsfile b/Jenkinsfile
index f4c1631..6a35dd6 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -36,6 +36,7 @@
 // Load shared libs
 common = new com.mirantis.mk.Common()
 
+timeout(time: 12, unit: 'HOURS') {
 node('qemu') {
     // Define global variables
     def workspace = common.getWorkspace()
@@ -122,6 +123,7 @@
                                 }
                             }
                         }
+
                     } else {
                       throw new Exception("Packer build failed")
                     }
@@ -238,3 +240,4 @@
         it =~ /${osImageForRegex}-x(64|32)-\d+${imageTypeForRegex}/
     }
 }
+}