Add missing sub-paths for providers that exist of local processes

[fmigneault]

Some endpoints such as processes/{id}/package are not available when targeting their corresponding /providers endpoint.
Also, jobs listing related to a provider returns an error instead of expected result, even though the service doesn't need to be queried at all for retrieving its jobs.

{
  "code": "UnauthorizedService",
  "description": "Service of id 'hummingbird' is not accessible."
} 

They must be added/corrected to reflect same behaviour as using their /processes/{id} -prefixed variant.