Keep consistency across configuration section names

Registered by Luka Peschke

For now, there is no rule concerning the name of configuration sections (ceilometer_collector, storage_gnocchi...). To keep consistency, the section names should have the following format: {backend_type}_{backend_name} (collector_gnocchi for example),
and the old ones should be deprecated.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Luka Peschke
Direction:
Needs approval
Assignee:
Luka Peschke
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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