fix default debug level in usage output

Signed-off-by: Thomas Stilwell <stilwellt@openlabs.co>
add custom logging level DATADUMP=5

also:

- change one log output to datadump as example
- rename some logger objects for consistency

Signed-off-by: Thomas Stilwell <stilwellt@openlabs.co>
Merge pull request #863 from benemorius/loglevel-datadump

add custom logging level DATADUMP=5