changed the loggers names to use hierachy

- with that change it's possible to set the log level
  for the whole package, so users like vdsm can set
  the required log level without knowing the exact logger
  name

Change-Id: I40fb7aca813800dd445e858406034736817cac9c
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1032667
Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>