reorganized config

CQ 5.4 isn't that flexible as CQ 5.5 and later versions:
* does not support nt:files with the .config extension in the config
  folders, but only sling:OsgiConfig nodes
* does not support sub-folders below /apps/<app>/config, but all config
  must be dropped into that folder
fixed race condition

at least for the moment. The performance impact shouldn't be that high,
though.