Add device_progress to GET /rack/:id

[dustinryerson]

Previously, GET /workspace/:id/rack returned workspaces with racks which included a device_progress property.

Would it be possible to add device_progress to GET /rack/:id? This would help in fully removing the remaining /workspace endpoints.

[karenetheridge]

Where in the UI would you be using this? This will help to know what properties to provide in the result.

[karenetheridge]

If this is a build-oriented view (converted from a workspace-oriented view?), there are some endpoints under /build that support ?with_device_health - https://joyent.github.io/conch/modules/Conch::Route::Build -- are you showing just one rack at a time, or all racks for a build?

[dustinryerson]

This is being used in the existing Data Center Browser. The values it returns are used to populate parts of the data center room and rack panels.