[NGA] Periodic tasks support

Registered by Sergey Lukjanov

Savanna needs long-running tasks execution for the following operations:

* decommissioning for cluster scaling;
* moving big data between clusters;
* jobs execution;
* etc.

We decided to implement it the easier way - periodically run long-running subtasks on each engines.

Blueprint information

Status:
Complete
Approver:
Sergey Lukjanov
Priority:
High
Drafter:
Sergey Lukjanov
Direction:
Approved
Assignee:
Sergey Lukjanov
Definition:
Approved
Series goal:
Accepted for 0.3
Implementation:
Implemented
Milestone target:
milestone icon 0.3
Started by
Sergey Lukjanov
Completed by
Sergey Lukjanov

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