generate error types for http

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

rpc.go

@@ -13,7 +13,7 @@ func (g *Generator) rpcGenerate(component string, plugin *protogen.Plugin) error
 			continue
 		}
 
-		gname := file.GeneratedFilenamePrefix + "_" + component + ".pb.go"
+		gname := file.GeneratedFilenamePrefix + "_micro_" + component + ".pb.go"
 		gfile := plugin.NewGeneratedFile(gname, ".")
 
 		gfile.P("// Code generated by protoc-gen-micro")
@@ -23,6 +23,7 @@ func (g *Generator) rpcGenerate(component string, plugin *protogen.Plugin) error
 		gfile.P()
 		gfile.P("import (")
 		gfile.P(`"context"`)
+		gfile.P()
 		gfile.P(`micro_api "github.com/unistack-org/micro/v3/api"`)
 		gfile.P(`micro_client "github.com/unistack-org/micro/v3/client"`)
 		gfile.P(`micro_server "github.com/unistack-org/micro/v3/server"`)