Exercise arcyon query --order

Summary:
Add at least minimal coverage on the --order parameter to 'arcyon query'
by exercising it.

Test Plan: testbed/arcyon/ $ ./exercise_arcyon.sh

Reviewers: oparanal

Reviewed By: oparanal

CC: phab

Differential Revision: https://sibld.phab.dev.bloomberg.com/D147
Tidying - use dict comp, remove redundant string

Remove redundant string constructor
Replace dict.update(genexp) with dictionary comprehension

Thanks to shayward

Test Plan: $ ./precommit.sh
Split down aoncmd_query.setupParser()

This function has gotten too long, split it down by kind of parameter
being added.

Test Plan:
$ arcyon query -h
testbed/arcyon/ $ ./exercise_arcyon.sh
$ ./precommit.sh