add reload and plugin support for hop

hosts/hosts.go

@@ -12,7 +12,6 @@ import (
 	"github.com/go-gost/core/hosts"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/x/internal/loader"
-	"google.golang.org/grpc"
 )
 
 type Mapping struct {
@@ -25,7 +24,6 @@ type options struct {
 	fileLoader  loader.Loader
 	redisLoader loader.Loader
 	httpLoader  loader.Loader
-	client      *grpc.ClientConn
 	period      time.Duration
 	logger      logger.Logger
 }
@@ -62,12 +60,6 @@ func HTTPLoaderOption(httpLoader loader.Loader) Option {
 	}
 }
 
-func PluginConnOption(c *grpc.ClientConn) Option {
-	return func(opts *options) {
-		opts.client = c
-	}
-}
-
 func LoggerOption(logger logger.Logger) Option {
 	return func(opts *options) {
 		opts.logger = logger