qeth: improving debug message handling

Improving debug message handling, moving ipa into messages from kernel
to dbf, some cleanups and typo fixes.

Signed-off-by: Peter Tiedemann <ptiedem@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>