Merge pull request #345 from deshipu/master

Post-release bugfixes
puppet plugin - minor fixes
Merge pull request #350 from deshipu/master

Patches 
Re-attach IP address after cleaning a host
IBM Blade center concurrency fixes
pep8
Merge pull request #352 from vi4m/ibm_fix

IBM Blade center concurrency fixes
Merge pull request #349 from andrzej-jankowski/master

puppet plugin - minor fixes
Merge github.com:allegro/ralph
Don't try to repeat the clean plugin
Remove Venture.netwroks, VentureRole.networks and check_ip