- This change adds two types to support opaque runtime
data passing through the APIServer:
- RuntimeConfiguration `data`
- RuntimeLinuxData type
- LinuxRuntimeData defines runtime specific information.
With this change, it will support `variant` only. The
optional RuntimeConfiguration `data` field encodes
runtime specific data to pass through the APIServer.
It is decoded as needed by the runtime.
- The idea is to eventually move all runtime specific data
into the `data` field so that the APIServer is only aware
of generic container information.