This patch allow the user to query the API in order to:
* Get current collector configuration (period, services, etc)
* Get collected metadata list for a given service (using currently
configured collector)
For this, the following work have been made:
* Each transformer can now export available metadata for a given
resource (using a FakeData object and the strip_resource_data method)
* Each collector can now export information for a given resource
about metadata (using associated transformer) and unit
* A new REST controller 'info' provides API entrypoints to those
information:
* configuration with GET /v1/info/config
* all active services information with GET /v1/info/services
* given active service information with GET /v1/info/services/SERVICE
Change-Id: I02b1bc5709371785748661b63c5e6f0705ce891b
Implements: blueprint user-experience-improvement (PARTIAL)
671fbb9fe3