Description of problem:

Sometimes customers need to perform some tasks not directly supported in deltacloud and platform-specific according to their particular requirements. Adding the capability to execute custom actions stored in a folder may provide a great flexibility without modifying the deltacloud-core code. Some examples may be (for rhevm which is the platform I'm testing):

- Modifing vm just after creating it ( adding custom properties, changing network, etc...)
- Managing permissions in VMs.
- Interacting with third-party tools.

Note that vm data should be provided when calling the custom tasks (vm id, opts, etc...)


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