Matt Riedemann 66a14df49e doc: prefix journalctl examples with sudo
In a devstack environment you likely need to use sudo
to run the journalctl command, so this adds that to
the examples.

Change-Id: Ibe6b71285a3014e80e06a50130f18bfbdb4ff3ab
2017-09-22 20:51:38 -04:00
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