Fix conditional test against useradd so it's compatible with Dash #232
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The test to see which version of
useradd
is installed uses 'bashisms' that fail on Ubuntu due to the fact that/bin/sh
is symlinked to Dash, causing the telegraf account to be created without the--system
option ever being passed.This change amends the syntax so that it's POSIX-compatible and more portable as a result. Fixes #231.