MAC spoofing failure doesn't result in panic mode (module removal), bis

On a feature/jessie built on 20150528, MAC spoofing fails for wlan0 (silly wl driver’s fault) but successes for eth0. And then, then network is left enabled.

Feature Branch: bugfix/9531-fix-mac-spoof-panic-mode-again

Related issues

Related to #8571 (closed)
Related to #8687 (closed)

Original created by @intrigeri on 9531 (Redmine)

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