moves plugin proxy to plugin package

pkg/plugins/datasource/tsdb/grpc.go

@@ -0,0 +1,22 @@
+package tsdb
+
+import (
+	proto "github.com/grafana/grafana/pkg/tsdb/models"
+	"golang.org/x/net/context"
+)
+
+type GRPCClient struct {
+	proto.TsdbPluginClient
+}
+
+func (m *GRPCClient) Query(ctx context.Context, req *proto.TsdbQuery) (*proto.Response, error) {
+	return m.TsdbPluginClient.Query(ctx, req)
+}
+
+type GRPCServer struct {
+	TsdbPlugin
+}
+
+func (m *GRPCServer) Query(ctx context.Context, req *proto.TsdbQuery) (*proto.Response, error) {
+	return m.TsdbPlugin.Query(ctx, req)
+}