shore-config - shore config used to determine renderer/executor

[eyal-mor]

Description

Original Author: @dkirillov
The Renderer and Executor/Backend which are part of Dependencies should now be determined by the renderer.type and executor.type found in the shore config.

For this, the shore config will need to be loaded. PersistentPreRunE for the root command runs before any of the other commands run, so most likely this would be the places where the shore config is loaded (LoadShoreConfig used from #174).

Example shore config:

renderer:
  type: jsonnet

executor:
  type: spinnaker
  config:
    ...

profiles:
  default:
    ...

This will set the Renderer to jsonnet and the Executor/Backend to spinnaker in the Dependencies.

Currently, there are only jsonnet and spinnaker types.