Currently the default CentOS value is to set printk to
7 4 1 7, showing up all the DEBUG messages.
OpenSUSE Leap 42.3 is using 1 4 1 7, while Ubuntu is
using 4 4 1 7.
This patch changes the default console_loglevel to 4 in AIOs
to only print KERN_WARNING, KERN_ERR, KERN_CRIT, and
KERN_ALERT, as this seems the best balance of reducing logging IO
while still exposing relevant errors in tests.
This patch also ensures users are aware that centos have a higher level
of kernel logging by default, so they can take their own decisions
about it.
Change-Id: I4ceb5b7d436b258656b0193dd5e2ef3efb44f592
447049070a