Fix for identifiying multi MNs created in same tx

-The find_masternodes function now searches for both txhash and address instead of only txhash to prevent matching different masternodes that were created in the same tx
-Moved the find_masternodes function out of the module.exports section of the database file since it doesn't need to be exported

lib/database.js

@@ -268,6 +268,19 @@ function init_heavy(cb) {
     return cb();
 }
 
+// find masternode by txid and 
+function find_masternode(txhash, addr, cb) {
+  Masternode.findOne({ txhash: txhash, addr: addr }).then((masternode) => {
+    if (masternode)
+      return cb(masternode);
+    else
+      return cb(null);
+  }).catch((err) => {
+    console.log(err);
+    return cb(null);
+  });
+}
+
 module.exports = {
   // initialize DB
   connect: function(database, cb) {
@@ -1243,12 +1256,15 @@ module.exports = {
 
   // determine if masternode exists and save masternode to collection
   save_masternode: function (raw_masternode, cb) {
+    var txhash = (raw_masternode.proTxHash != null ? raw_masternode.proTxHash : raw_masternode.txhash);
+    var addr = (raw_masternode.proTxHash != null ? raw_masternode.payee : raw_masternode.addr);
+
     // lookup masternode in local collection
-    module.exports.find_masternode((raw_masternode.proTxHash != null ? raw_masternode.proTxHash : raw_masternode.txhash), function (masternode) {
+    find_masternode(txhash, addr, function (masternode) {
       // determine if the claim address feature is enabled
       if (settings.claim_address_page.enabled == true) {
         // claim address is enabled so lookup the address claim name
-        find_address((raw_masternode.proTxHash != null ? raw_masternode.payee : raw_masternode.addr), false, function(address) {
+        find_address(addr, false, function(address) {
           if (address) {
             // save claim name to masternode obejct
             raw_masternode.claim_name = address.name;
@@ -1328,19 +1344,6 @@ module.exports = {
     }
   },
 
-  // find masternode by txid
-  find_masternode: function (txhash, cb) {
-    Masternode.findOne({ txhash: txhash }).then((masternode) => {
-      if (masternode)
-        return cb(masternode);
-      else
-        return cb(null);
-    }).catch((err) => {
-      console.log(err);
-      return cb(null);
-    });
-  },
-
   // remove masternodes older than 24 hours
   remove_old_masternodes: function (cb) {
     Masternode.deleteMany({ lastseen: { $lte: (Math.floor(Date.now() / 1000) - 86400) } }).then(() => {