Kazuyoshi Kato 73d28ddeb2 client: surface a connection error more clearly ...

gRPC-Go recently added grpc.WithReturnConnectionError() which improves
the situation of #2576.

Permission errors:

  % ./bin/ctr t ls
  ctr: failed to dial "/run/containerd/containerd.sock": connection error: desc = "transport: error while dialing: dial unix /run/containerd/containerd.sock: connect: permission denied"
  %

Non-existent sockets:

  % ./bin/ctr -a notfound t ls
  ctr: failed to dial "notfound": context deadline exceeded: connection error: desc = "transport: error while dialing: dial unix://notfound: timeout"
  %

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

2021-07-02 14:56:04 -07:00

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