[temporary] adds some logging for debugging sandbox creation failure

[dougbtv]

...when there's no error message, we don't get much, so... this adds something to look at, at least.

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@dougbtv: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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• 2eb3d07 Merge pull request Remove code that sets lo to down prior ns deletion #104 from MikeZappa87/issue/removeloopbackup
• b1325e1 adds some logging for debugging sandbox creation failure with no error message

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