Remove getOSet

Author: DimaStebaev

contracts/INodeRotation.sol

@@ -54,12 +54,10 @@ interface INodeRotation {
         returns (uint newNode);
     function selectNodeToGroup(bytes32 schainHash) external returns (uint nodeIndex);
 
-
     function isSchainCreation(bytes32 schainHash) external view returns (bool);
     function isNewNodeFound(bytes32 schainHash) external view returns (bool);
     function isRotationInProgress(bytes32 schainHash) external view returns (bool);
     function getLeavingHistory(uint nodeIndex) external view returns (LeavingHistory[] memory);
-    function getOSet(bytes32 schainHash) external view returns (uint256[] memory);
     function getPreviousNode(bytes32 schainHash, uint256 nodeIndex) external view returns (uint256);
     function getRotation(bytes32 schainHash) external view returns (Rotation memory);
 }