pool: Store reward unlock height in database

lib/coins/xmr.js

@@ -127,6 +127,8 @@ function Coin(data){
         Overkill?  Sure.  But that's what we do here.  Overkill.
          */
 
+        this.unlockHeight = template.unlock_height;
+
         // Set this.blob equal to the BT blob that we get from upstream.
         this.blob = template.blocktemplate_blob;
         this.idHash = crypto.createHash('md5').update(template.blocktemplate_blob).digest('hex');

lib/pool.js

@@ -578,6 +578,7 @@ function recordShareData(miner, job, shareDiff, blockCandidate, hashHex, shareTy
         global.database.storeBlock(job.height, global.protos.Block.encode({
             hash: hashHex,
             difficulty: blockTemplate.difficulty,
+            unlockHeight: blockTemplate.unlockHeight,
             shares: 0,
             timestamp: Date.now(),
             poolType: miner.poolTypeEnum,