t/qemu-runlinux: Kernel verbosity control via -v
0: ERROR+ on boot/run 1: INFO+ on run 2: INFO+ on boot/run 3: DEBUG+ on boot/run It is convenient not to see large kernel boot log on every test run. "1" (single -v) is also convenient: one can skip the boot log but still see details of what is going on when test workload is run. -vv and -vvv are there to see full picture.
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