message: Fix cluster IO import to std::io
diff: @@ -2,7 +2,6 @@ use std::io::Error as IoError;
  use serde::export::Formatter;
  use fluvio::FluvioError;
  -use fluvio_future::io::Error;
  use k8_config::{ConfigError as K8ConfigError};
  use k8_client::{ClientError as K8ClientError};
  @@ -34,7 +33,7 @@ impl std::fmt::Display for ClusterError {
  }
  impl From<IoError> for ClusterError {
  - fn from(err: Error) -> Self {
  + fn from(err: IoError) -> Self {
  Self::IoError(err)
  }
  }
  