Pause Upgrade button is present in the wizard even after Upgrade is finalized

Once the Express Upgrade is finalized the wizard still shows 'Pause Upgrade' button.

Expected Result: Pause Upgrade should be hidden or grayed out at this stage

Two side-effects of this issue:
1. Bad user experience - upgrade has completed, we still let them pause the upgrade
2. If user pauses the upgrade, it brings Ambari into a state where it thinks that Upgrade is actually paused and locks the screen for any actions. The UI still shows "Upgrade:Action Required" but there is no way to open the EU wizard again. As a result, Ambari functionality cannot be used