validation/util/container: Use a local UUID for stdout/stderr
validation/util/container: Use a local UUID for stdout/stderr

So validation/create.t gives:

  ok 4 - create MUST generate an error if the ID provided is not unique
    ---
    {
      "error": "exit status 1",
      "reference": "https://github.com/opencontainers/runtime-spec/blob/v1.0.0/runtime.md#create",
      "stderr": "container with id exists: 4a142dd0-e5bc-48b3-9abd-49c1a8f7c498\n"
    }
    ...

instead of:

  ok 4 - create MUST generate an error if the ID provided is not unique
    ---
    {
      "error": "open /tmp/ocitest842577116/stdout-178f8311-9cc7-42c5-b91e-abbe29eaf582: file exists",
      "reference": "https://github.com/opencontainers/runtime-spec/blob/v1.0.0/runtime.md#create"
    }
    ...

The old code hit the internal error, while the new code is checking
for a runtime error.

Signed-off-by: W. Trevor King <f75897670c17327c42ab201733fb8a81ff9f4c34@tremily.us>

liangchenye/ocitools,wking/ocitools-v2,opencontainers/runtime-tools,wking/ocitools-v2,opencontainers/runtime-tools,opencontainers/ocitools,opencontainers/ocitools,liangchenye/ocitools