InitSlave: Formatting, indentation. Fixed debug level.

Conflicts:

	src/lan/address.ycp
Only devices with L2 support can be enslaved in bond. See bnc#719881

When creating bond device on s390 all devices used to be offered for
enslaving. This was incorrect because devices without MAC cannot be
used by Linux bond driver.

Conflicts:

	src/lan/address.ycp
Added loading qeth config during NICs switching (SetItem).
Updated changelog

Conflicts:

	VERSION
	package/yast2-network.changes
Merge pull request #43 from mchf/master

Ported from Code-11-SP2 (original pull request #35)
s390 - bnc#719881 - only devices with L2 support can be enslaved in bond
  - improved filtering of devices available for enslaving.
  - able to load qeth config from system (layer2 support and other
    qeth attributes used to be lost once qeth device was configured)