fio: double CPU clock wrap in output file not in STDERR

[joshuacox]

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Description of the bug:

In my json output I have fio: double CPU clock wrap in my output file and not in STDERR

It does not belong in my output and gives me breakage upon trying to use the resulting json. This sort of thing belongs in STDERR.

Environment: arch linux

uname -r
5.13.10-arch1-1

fio version:

fio --version
fio-3.27

Reproduction steps

This is an intermittent issue that I only see every now and then, my automation fails and I hunt down the reason why and it is this errant line in the json. The command for reference looks like:

fio  --output=output.json --output-format=json  readtest.fio 1>/tmp/fio.log 2>/tmp/fio.err

readtest.fio:

[global]
bs=4K
iodepth=1
direct=1
ioengine=libaio
group_reporting
time_based
runtime=5
numjobs=1
name=read-test-job
rw=randread
size=10M
							
[job1]
filename=/test/testfile

an acceptable alternative would be to have that inserted into the json itself

{
  error_messages: [ "fio: double CPU clock wrap" ]
}

[sitsofe]

This sounds like a dupe of #731 ...