Allow network interface names to be filtered by the given
regular expression. The expression is handled by the bash
regexp operator. Interface names matching the rule will be
filtered out, all others stay. It is also possible to pass
the variable kiwi_oemnicfilter as kernel command line in a
PXE deployment. Fixes#245
Some attributes needed to be changed in the test xmls. With this
commit all the description files are consistent with the new co-
occurrence constraints.
The common functions baseStripInitrd and baseStripKernel need
to be skipped if the initrd system is set to dracut. They
read that information from the exported kiwi_initrd_system
profile environment variable
