Don't update data in nailgun's models each time when node sends hearbeat

Registered by Evgeniy L

It can be done in several places, in nailgun and on agent side (caching).

We have a patch from Lukasz which partly solve problem
https://github.com/loles/fuelweb/commit/36b16e0a08946230b51888098a11bbd2de729a6c

PRD-1943

Blueprint information

Status:
Complete
Approver:
None
Priority:
High
Drafter:
None
Direction:
Needs approval
Assignee:
None
Definition:
Superseded
Series goal:
Accepted for 4.1.x
Implementation:
Not started
Milestone target:
None
Completed by
Evgeniy L

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