Add preconfigure execution for identitybuilder.

src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/AbpIdentityDomainModule.cs

@@ -9,8 +9,9 @@ namespace Volo.Abp.Identity
     {
         public override void ConfigureServices(IServiceCollection services)
         {
-            //TODO: How to configure options of AddIdentity (and return value)
+            var identityBuilder = services.AddAbpIdentity();
-            services.AddAbpIdentity();
+            services.ExecutePreConfiguredActions(identityBuilder);
+
             services.AddAssemblyOf<AbpIdentityDomainModule>();
         }
     }