They will be stored in redux and the PageReloadOverlay will be displayed.
Note that this commit also introduces a subtle (and yet important!) change:
the location URL is now always set, regardless of the configuration loading or
not. This is needed in order for the retry logic to pick it up.
Do the selection in mapStateToProps so the container itself doesn't need to
receive all the props that each overlay needs.
Each overlay is responsible for fetching their own props and for providing a
"needsDisplay" static method wich will be called with the full redux state and
should return true if the overlay needs displaying.
Also eliminate duplicated state keeping: the connection and conference error
states can be fetched from their respective base features.
