Add init that sets up logging for exceptional cases

[tstirrat15]

Fixes #368

Description

See #368. For error cases that were about missing commands or invalid argument sets, the logic that set up zerolog was never invoked, which meant that the output was a JSON blob instead of the prettily-formatted zerolog output. This makes the output more visually consistent.

Changes

• Add init to command that sets up logging in the event that zl.RunE isn't actually called.

  Testing

  Review. Checkout, go build cmd/zed/.., and run the resulting binary with some invalid args. ./main foo and ./main validate should do it.

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[tstirrat15]

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