Gather application data on every step

[nirs]

We can gather application data on every step (deploy, protect, ...), even if the step was successful. This will make it easy to follow the application state through the flow.

We can keep the data in gather/app-name/step-name:

gather/
  appset-deploy-rbd/
    deploy/
    protect/
    failover/
    relocate/
    unprotect/
    undeploy/

Issues:

• Gathering single application namespaces should be very quick, but it since the gather package is very aggressive about rate limits, it may cause trouble to other apps. Maybe we need to add an option to gather data more politely.