- added Sameness Group to config entries
- added Sameness Group to subscriptions
* generated proto files
* added Sameness Group events to the state store
- added test cases
* Refactored health RPC Client
- moved code that is common to rpcclient under rpcclient common.go. This will help set us up to support future RPC clients
* Refactored proxycfg glue views
- Moved views to rpcclient config entry. This will allow us to reuse this code for a config entry client
* added config entry RPC Client
- Copied most of the testing code from rpcclient/health
* hooked up new rpcclient in agent
* fixed documentation and comments for clarity
