Unexport grpc service types

Since these are registered and the interface is what matters, these
Service types do not need to be exported.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

server/config.go

@@ -33,12 +33,14 @@ type Config struct {
 	md toml.MetaData
 }
 
+// GRPCConfig provides GRPC configuration for the socket
 type GRPCConfig struct {
 	Address string `toml:"address"`
 	Uid     int    `toml:"uid"`
 	Gid     int    `toml:"gid"`
 }
 
+// Debug provides debug configuration
 type Debug struct {
 	Address string `toml:"address"`
 	Uid     int    `toml:"uid"`
@@ -46,10 +48,12 @@ type Debug struct {
 	Level   string `toml:"level"`
 }
 
+// MetricsConfig provides metrics configuration
 type MetricsConfig struct {
 	Address string `toml:"address"`
 }
 
+// CgroupConfig provides cgroup configuration
 type CgroupConfig struct {
 	Path string `toml:"path"`
 }