Dedicated operator contract stub for DKG result submission tests

Mistakenly ommitted in the previous commit.

Author: pdyraga

solidity/contracts/stubs/KeepRandomBeaconOperatorDKGResultStub.sol

@@ -0,0 +1,52 @@
+pragma solidity 0.5.17;
+
+import "../KeepRandomBeaconOperator.sol";
+
+
+contract KeepRandomBeaconOperatorDKGResultStub is KeepRandomBeaconOperator {
+    constructor(address _serviceContract, address _stakingContract)
+        public
+        KeepRandomBeaconOperator(_serviceContract, _stakingContract)
+    {
+        groupSelection.ticketSubmissionTimeout = 100;
+    }
+
+    function setGroupSize(uint256 size) public {
+        groupSize = size;
+        groupSelection.groupSize = size;
+        dkgResultVerification.groupSize = size;
+    }
+
+    function setGroupThreshold(uint256 threshold) public {
+        groupThreshold = threshold;
+        dkgResultVerification.signatureThreshold = threshold;
+    }
+
+    function setDKGResultSignatureThreshold(uint256 threshold) public {
+        dkgResultVerification.signatureThreshold = threshold;
+    }
+
+    function setResultPublicationBlockStep(uint256 step) public {
+        resultPublicationBlockStep = step;
+    }
+
+    function getGroupSelectionRelayEntry() public view returns (uint256) {
+        return groupSelection.seed;
+    }
+
+    function getTicketSubmissionStartBlock() public view returns (uint256) {
+        return groupSelection.ticketSubmissionStartBlock;
+    }
+
+    function isGroupSelectionInProgress() public view returns (bool) {
+        return groupSelection.inProgress;
+    }
+
+    function setGasPriceCeiling(uint256 _gasPriceCeiling) public {
+        gasPriceCeiling = _gasPriceCeiling;
+    }
+
+    function timeDKG() public view returns (uint256) {
+        return dkgResultVerification.timeDKG;
+    }
+}