Support custom port for MongoDB config

test/orm/mongoid.rb

@@ -1,7 +1,7 @@
 require 'mongoid/version'
 
 Mongoid.configure do |config|
-  config.connect_to("devise-test-suite")
+  config.load!('test/support/mongoid.yml')
   config.use_utc = true
   config.include_root_in_json = true
 end

test/support/mongoid.yml

@@ -0,0 +1,6 @@
+test:
+  sessions:
+    default:
+      database: devise-test-suite
+      hosts:
+        - localhost:<%= ENV['MONGODB_PORT'] || '27017' %>