Supported `ContainerLogger` with nested containers.
Supported `ContainerLogger` with nested containers.

For nested containers, the sandbox directory still exists.  However,
ExecutorInfo's no longer map directly one-to-one to containers.
That means a nested container does not have an associated ExecutorInfo.

The `ExecutorInfo` parameter provides metadata for the `ContainerLogger`
including the FrameworkID, ExecutorID, environment variables, and
arbitrary Labels.  For nested containers, the top-level parent's
`ExecutorInfo` should be sufficient to provide the same metadata.

Review: https://reviews.apache.org/r/52412/

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