Merge pull request #79 from mchf/Code-11-SP2

Ported fixes from SP3
Merge pull request #83 from mchf/Code-11-SP2

Read tun / tap settings from netconfig
Merge pull request #85 from mchf/Code-11-SP2

No objections and already merged in Code-11-SP3.
Merge pull request #88 from mchf/Code-11-SP2

Do not propose bridge device for virtualization host on s390 arch.