The URL alone doesn't guarantee uniqueness

This is necessary for the namespace query param

- Service to manage X-Nomad-Index values
- Adapter method for reloading relationships with additional params
- Pattern for watching models and model relationships using EC

Now that blocking queries are going to be in play, We can no longer
pretend the two requests are one, since they have independent nomad
indices.

Generated with a codemode:
https://github.com/ember-cli/ember-modules-codemod

Ember tries to be clever by showing cached jobs instead of a loading spinner
in the event that a user starts on nodes, loads a couple jobs through
allocation relationships, then visits jobs.