* Move healthcheck proto to separate file, use throughout
Signed-off-by: Kevin Lingerfelt <kl@buoyant.io>
* Remove Check message from healthcheck.proto
Signed-off-by: Kevin Lingerfelt <kl@buoyant.io>
* Standardize healthcheck protobuf import name
Signed-off-by: Kevin Lingerfelt <kl@buoyant.io>