app-authz-uma-photoz quickstart doesn't handle expired RPT

When KC returns the response with RPT token to the frontend client, the response contains also the refresh token. So refreshing of RPTs is possible.

However the keycloak-authz.js client doesn't have any support for automatically refreshing RPT token. I mean something similar, which is provided by keycloak.js itself (method "keycloak.updateToken" which automatically refreshes the token if needed). Due this limitation, it seems there is a bug in our quickstart.

When you try the quickstart "app-authz-uma-photoz" and you go through the flow like this:

• Open http://localhost:8080/photoz-html5-client and login as jdoe
• Create some album
• Wait 10 minutes (RPT expiration is same like AccessTokenLifespan, so 5
  minutes by default)
• Try to create some album again - now fails with 403 due the RPT
  expired and no support for refreshing it in the keycloak-authz.js or the
  application itself