Introduce a "_flaky_test" function for shell based I/O tests which
accepts a GitLab issue URL, and causes the I/O test to be skipped
unless the $QEMU_TEST_FLAKY_TESTS environment variable is set.
The equivalent "skip_flaky" test decorator is added for python based
I/O tests with the same behaviour.
This is used by:
* Test 151 which fails in QEMU private AWS runners due to failure
to make progress in time
* Test 181 which fails with a non-responsive QEMU on AWS runners
with the QED format
* Test 185 which fails in GitLab shared runners
* Test 308 which fails to see disk usage increase after fallocate
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Daniel P. Berrangé
35d132c69b