Fixes #3620

Previously we concatenated tags into task service IDs. This could break
deregistration of tag names that contained double //s like some Fabio
tags.

This change breaks service ID backward compatibility so on upgrade all
users services and checks will be removed and re-added with new IDs.

This change has the side effect of including all service fields in the
ID's hash, so we no longer have to track PortLabel and AddressMode
changes independently.