DRY up Subprocess.spawn
DRY up Subprocess.spawn

This was recommended by RuboCop as a means of reducing the number of
statements in the method. I'm not really convinced this was worth it,
but it's an experiment for now.

Change-Id: I88b8e7adb5539650fe490b889f2809fff1d57146
Reviewed-on: http://gerrit.causes.com/44894
Tested-by: jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@brigade.com>
Reviewed-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>

blech75/overcommit,blech75/overcommit,gnagel/overcommit,gnagel/overcommit,oxocode/overcommit,oxocode/overcommit,TheSooth/overcommit,TheSooth/overcommit