Untrack some more unnecessary .class files.
Improve the provisioning of io.

Change the way we handle io to make it easier to add new host
allocation and vm scheduling policies. Also improve log messages.
More unnecessary .class files. Fix logging issue
DynamicWorkload with IoProvisioner support
IoProvisioner working on power examples
Planetlab traces with an initial model for iops.
move planetlab workloads
Update .gitignore to ignore logs
Untrack .classes
Update .gitignore