[TEST] CX7 timeouts on reconfig w/ page pool failure injection

Hi!

The CX7 testing in NIPA is looking pretty good, one major source of
noise, tho, is that the pp-alloc test sometimes locks rtnl for
a minute.

Here's a failure in that test itself:

# # Exception| subprocess.TimeoutExpired: Command '['ethtool', '-G', 'ens25f1np1', 'rx', '2048']' timed out after 20 seconds
# # Exception| 
# not ok 1 pp_alloc_fail.test_pp_alloc

https://netdev.bots.linux.dev/logview.html?f=/logs/hwksft/CX7-dbg/results/763842/test-outputs/36-pp-alloc-fail-py/stdout

Then the next test that runs also times out during setup:

# subprocess.TimeoutExpired: Command '['ip', '--json', '-d', 'link', 'show', 'dev', 'ens25f1np1']' timed out after 20 seconds
not ok 1 selftests: drivers/net/hw: rss_api.py # exit=1

https://netdev.bots.linux.dev/logs/hwksft/CX7-dbg/results/763842/test-outputs/37-rss-api-py/stdout

pp_alloc test can fail, but spilling into the next test is a problem.

At the retry things clear up enough to return to happiness, tho:

https://netdev.bots.linux.dev/logs/hwksft/CX7-dbg/results/763842/test-outputs/37-rss-api-py-retry/stdout

I haven't try to dig into where it is blocked but does this ring any
bells?