Always display at least 5% of the progress bar

So that the animation is visible.

Change-Id: I8212046e6102c287fcdcc8d0bdba5eb87acd1de5
Closes-bug:  #1302028

tuskar_ui/infrastructure/overcloud/tabs.py

@@ -73,7 +73,7 @@ class OverviewTab(tabs.Tab):
         return {
             'overcloud': overcloud,
             'roles': role_data,
-            'progress': progress,
+            'progress': max(5, progress),
             'dashboard_urls': overcloud.dashboard_urls,
             'last_failed_events': last_failed_events,
         }