[#26] netmap: Add NOT and UNIQUE keywords

Signed-off-by: Airat Arifullin a.arifullin@yadro.com

netmap/types.proto

@@ -33,6 +33,9 @@ enum Operation {
 
   // Logical AND
   AND = 8;
+
+  // Logical negation
+  NOT = 9;
 }
 
 // Selector modifier shows how the node set will be formed. By default selector
@@ -119,6 +122,9 @@ message PlacementPolicy {
 
   // List of named filters to reference in selectors
   repeated Filter filters = 4 [json_name = "filters"];
+
+  // Unique flag defines non-overlapping application for replicas
+  bool unique = 5 [json_name = "unique"];
 }
 
 // NeoFS node description