Define the entire server URL as resource

Currently the URL is only partially customizable, part of
it is hard-coded and there's no clear indication of it.
Define the entire URL as resource string and use placeholders
for runtime variables.

Also, invalidate old overrides by changing the name of the
resource.

Warning: lineage.updater.uri must be updated accordingly

Change-Id: Iecfdaf9d422d08a707c7319bafea5befc6b757d2