Matt Riedemann 5085dc0fa5 doc: add journalctl example for grepping the logs
I had to dig around for awhile to figure this out, so
this adds an example on how to grep journalctl nova logs
for a server instance UUID.

Change-Id: I6a5c47fbcba3af1822e2f9efc2ac20ebe0387f3f
2017-09-25 19:17:31 +00:00
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