Update `ADM_deploy_adhoc_storage` RPC

- scord-ctl: The new implementation for the RPC handler makes use of
  the new configuration files to construct the command line for
  deployment. The RPC handler will now reply with the generated path
  for the adhoc storage system (`adhoc_dir`) in addition to an
  appropriate error code.

- scord: The RPC handler has been refactored and will now propagate
  `adhoc_dir` to the client API.

- API: The newly generated `adhoc_dir` is propagated to client code.

- examples: Updated to account for the new `adhoc_storage_path` argument in
  the APIs.

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