Initialization module using log4net directly disables logging

Description

1. Add the following intialization module:

   [InitializableModule]

   public class AA : IInitializableModule

   {

   private static readonly log4net.ILog _log = log4net.LogManager.GetLogger("test");

   public void Initialize(InitializationEngine context)

   {}

   public void Uninitialize(InitializationEngine context)

   {}

   }

EXPECTED: Logging works
ACTUAL: Logging stops working

Note: Sometimes for this bug fix to take affect you have to clear "Temporary ASP.NET Files", ie C:\Windows\Microsoft.Net\Framework64\v4.0.30319\Temporary ASP.NET Files\

WORKAROUND: An easy fix is to use namespace EPiServer.Logging.Compatiblity instead of log4net, to make sure log4net can be safely initialized from CMS instead from a custom initialization module.