[Core] Make sure WebService is initialized framework service

The framework service can kick off the activation system, which
makes web requests.

BXC16245 - [XS]Upgrade workflow throws an NRE while trying to activate
a license
[Core] Clean up the WebService

Had lots of pointless lazies and singletons, and could explode on
platforms without a credentials provider.
[md-addins] Bump to track WebService API