allow foundation validators to change their pubkey unlimited number of times

Author: uprendis

contracts/sfc/SFC.sol

@@ -128,11 +128,11 @@ contract SFC is SFCBase, Version {
         require(getValidator[1].auth == 0x541E408443A592C38e01Bed0cB31f9De8c1322d0, "not mainnet");
         require(pubkey.length == 66 && pubkey[0] == 0xc0, "malformed pubkey");
         uint256 validatorID = getValidatorID[msg.sender];
-        require(validatorID <= 59, "not legacy validator");
+        require(validatorID <= 59 || validatorID == 64, "not legacy validator");
         require(_validatorExists(validatorID), "validator doesn't exist");
         require(keccak256(pubkey) != keccak256(getValidatorPubkey[validatorID]), "same pubkey");
         require(pubkeyHashToValidatorID[keccak256(pubkey)] == 0, "already used");
-        require(validatorPubkeyChanges[validatorID] == 0, "allowed only once");
+        require(validatorPubkeyChanges[validatorID] == 0 || validatorID == 64 || validatorID <= 12, "allowed only once");
 
         validatorPubkeyChanges[validatorID]++;
         pubkeyHashToValidatorID[keccak256(pubkey)] = validatorID;