Pass command and trust_prefix to the validation of rkt task configuration

[nak3]

No description provided.

[dadgar]

Those values are not passable in the driver config?

[nak3]

Thank you. I added them to the driver config.

[dadgar]

We should add some tests for the new flags before merging this

[nak3]

Thank you. I added tests. TestRktTaskValidate might not be necessary, since other drivers don't do this.

[dadgar]

Looks good! Last thing I forgot is please add the new fields to the rkt docs. https://github.com/hashicorp/nomad/blob/master/website/source/docs/drivers/rkt.html.md

[nak3]

Thank you. The docs already has the field command and trust_prefix. Should I still need to add something?

[dadgar]

Oh you are right! Sorry

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