Align ux across nomad alloc sub commands

[drewbailey]

Ensure swapping subcommands (exec/logs) allows for a consistent and predictable user experience.

nomad alloc exec requires a an allocation id, and if the allocation has multiple tasks a -task flag.

nomad alloc exec -task=task-name <alloc> /bin/sh

nomad alloc logs allows for a second param for the task

nomad alloc logs <alloc> task

[mr-karan]

@drewbailey I'd want to pick this up if no one's working on it :)

Just to confirm, the desired behaviour should be:

nomad alloc exec -task=task-name <alloc>
nomad alloc logs -task=task-name <alloc>

Does this seem correct?

[drewbailey]

Hey @mr-karan, that's great! I don't believe anyone is currently working on this already.

Preserving backwards compatibility is the main thing with this issue, so I think your proposed solution works.

nomad alloc exec is unchanged, nomad alloc logs gets a new optional -task flag. We'll probably want to ensure that -task=task-name and nomad alloc logs <alloc> <task> work together as well

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