cloud mount: remote storage support hdfs

weed/pb/remote.proto

@@ -46,6 +46,12 @@ message RemoteConf {
   string wasabi_secret_key = 41;
   string wasabi_endpoint = 42;
   string wasabi_region = 43;
+
+  repeated string hdfs_namenodes = 50;
+  string hdfs_username = 51;
+  string hdfs_service_principal_name = 52;
+  string hdfs_data_transfer_protection = 53;
+
 }
 
 message RemoteStorageMapping {