Adds back 2 deprecated fields

eos_cta/protobuf/cta_admin.proto

@@ -248,6 +248,9 @@ message ArchiveRouteLsItem {
   cta.common.EntryLog creation_log          = 4;
   cta.common.EntryLog last_modification_log = 5;
   string comment                            = 6;
+
+  // DEPRECATED: will be removed
+  string instance                           = 9999;
 }
 
 message DriveConfigItem {
@@ -437,6 +440,9 @@ message StorageClassLsItem {
   cta.common.EntryLog creation_log          = 4;
   cta.common.EntryLog last_modification_log = 5;
   string comment                            = 6;
+
+  // DEPRECATED: will be removed
+  string disk_instance                      = 9999;
 }
 
 message TapeLsItem {