Added retry step to aptly publishing during pkg build

Change-Id: Ie9521f39aab5f43af9513944c420f303ca91825e
diff --git a/build-debian-packages-libvirt-exporter.groovy b/build-debian-packages-libvirt-exporter.groovy
index 2051504..4c3f732 100644
--- a/build-debian-packages-libvirt-exporter.groovy
+++ b/build-debian-packages-libvirt-exporter.groovy
@@ -60,7 +60,9 @@
                     }
                     stage("publish") {
                         aptly.snapshotRepo(APTLY_URL, APTLY_REPO, timestamp)
-                        aptly.publish(APTLY_URL)
+                        retry(2){
+                          aptly.publish(APTLY_URL)
+                        }
                     }
                 }
             }