Fixups for "dx describe JOBID"
Fixups for "dx describe JOBID"

Summary:
* Align input and output fields correctly
* Show "$" before price
* Show fingerprint of ssh public key rather than the whole thing

Test Plan: tested by hand

Reviewers: gduggal

Reviewed By: gduggal

Differential Revision: https://dnanexus.phacility.com/D1256

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