Update CLI to use ISO_8601 time format.

[jrasell]

This change updates the formatTime CLI helper function to return an ISO_8601 time format which will make CLI time usage more consistent and easier. Previously the time format was in US style format which was somewhat confusing to non US users.

This has been tested locally:

./jrasell-nomad job history example
Version     = 0
Stable      = true
Submit Date = 2018-01-30T08:32:29Z

./jrasell-nomad alloc-status f1bab94a |grep 'Started At' 
Started At     = 2018-01-30T08:32:30Z

Closes #3806

[jippi]

looks good! my personal preference is RFC 2822 formatted dates, less dense to grok as a human :)

[danielmotaleite]

@jippi true, but they are also hard to parse (and sort) by other tools. ISO_8601 is a little harder to read by human, but very consistent and flexible

[danielmotaleite]

and thanks for the PR @jrasell

[chelseakomlo]

Thanks for this PR, looks good!

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