TCP: Set read priority to low

PRIORITY_DEFAULT is used for example for X Server events or other UI
tasks. This should help to prefer UI events before network events.
2 jobs for master in 29 seconds (queued for 4 seconds)
Name Stage Failure
failed
run-test Test
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Uploading artifacts for failed job
Uploading artifacts...
WARNING: coverage.xml: no matching files
ERROR: No files to upload
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1