[Task-Based] Reduce size of serialised tasks

Registered by Bulat Gaifullin on 2016-02-04

Now the size of serialised tasks is more that 600M for 1000 nodes.
Since the task parameters is same for all nodes, we can split the serialised tasks into 2 parts.
first part will contain the parameters of task.
the second part will contain only connections between tasks. the task['id'] will be used as unique ID to lookup parameters for task.

Blueprint information

Status:
Started
Approver:
None
Priority:
Undefined
Drafter:
Bulat Gaifullin
Direction:
Needs approval
Assignee:
Bulat Gaifullin
Definition:
New
Series goal:
None
Implementation:
Started
Milestone target:
None
Started by
Bulat Gaifullin on 2016-02-04

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Gerrit topic: https://review.openstack.org/#q,topic:bp/reduce-size-of-serialized-tasks,n,z

Addressed by: https://review.openstack.org/276195
    Split task parameters and task links

Addressed by: https://review.openstack.org/281448
    Moved parameters of tasks from graph to separate dict

Addressed by: https://review.openstack.org/280813
    Enable message compression for RPC

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