Add some retries to try to work around transient failures

Change-Id: I000decebfdafd66aed1a1e0620eb926772905af4
(cherry picked from commit 66ee90186ba604c95fbb61144adf31e1ddd194f7)
diff --git a/roles/simulate-fabric/files/simulate-fabric-playbook.yml b/roles/simulate-fabric/files/simulate-fabric-playbook.yml
index 55b6587..da1e876 100644
--- a/roles/simulate-fabric/files/simulate-fabric-playbook.yml
+++ b/roles/simulate-fabric/files/simulate-fabric-playbook.yml
@@ -13,6 +13,10 @@
         update_cache=yes
         cache_valid_time=3600
       become: yes
+      register: result
+      until: result | success
+      retries: 15
+      delay: 60
       with_items:
        - bridge-utils