Enhance "persist" hook in DAO.updateOrCreate

Report `ctx.isNewInstance` when the connector provides this info.

lib/dao.js

@@ -521,6 +521,7 @@ DataAccessObject.updateOrCreate = DataAccessObject.upsert = function upsert(data
           var context = {
             Model: Model,
             data: data,
+            isNewInstance: info && info.isNewInstance,
             hookState: ctx.hookState,
             options: options
           };

test/persistence-hooks.suite.js

@@ -1722,7 +1722,8 @@ module.exports = function(dataSource, should) {
 
             if (dataSource.connector.updateOrCreate) {
               observedContexts.should.eql(aTestModelCtx({
-                data: { id: 'new-id', name: 'a name' }
+                data: { id: 'new-id', name: 'a name' },
+                isNewInstance: true,
               }));
             } else {
               observedContexts.should.eql(aTestModelCtx({
@@ -1750,7 +1751,8 @@ module.exports = function(dataSource, should) {
                 data: {
                   id: existingInstance.id,
                   name: 'updated name'
-                }
+                },
+                isNewInstance: false
               }));
             } else {
               // For Unoptimized connector, the callback function `pushContextAndNext`