* updte workload api to use repeated addresses
* bug in xds resource name
* handle primary key and on-demand lookup, add uid to test
* lint fix
* envoy only ever needs workloads
* removed unsed protos
* updates to workload API per design doc
* add Service to proto
* simplify convert, minimuze Service api
* remove oneOf, keep Service reserved
* switch back to oneOf
* lint fix
* test fixes
* fix naming for go XDS server
* clean up protos with reserved fields
* lint fixes