add support for 'early loading' modules, so that nearly all configuration...

add support for 'early loading' modules, so that nearly all configuration files can be read from Realtime storage
add warning for when file mapping is found but the engine is not available
add warning for trying to map 'logger.conf', since it cannot be reliably mapped


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6034 65c4cc65-6c06-0410-ace0-fbb531ad65f3