[qa] MTU test is wrong because DF flag is not supported in busybox.

[Atsuko Ito]

Currently, we're pinging with packet size 1500, 9000, 9001 - 28 and regarding overlay padding if vxlan to check MTU https://github.com/openstack/fuel-qa/blob/master/fuelweb_test/tests/test_jumbo_frames.py#L194
However, ping from busybox from Cirros doesn't support PMUTd (setting DF flag), so the test is inconsistent, because ICMP is fragmented.

Test should use PMTUd enabled ping (required Cirros rebuild) or
test should not check for 9001 byte packet (some border cases could be passed by the way).

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/307713

[Atsuko Ito (yottatsa)]

Relates to https://product-ci.infra.mirantis.net/job/9.0.system_test.ubuntu.jumbo_frames/82/console https://mirantis.testrail.com/index.php?/tests/view/4471505

[Alexandr Kostrikov (akostrikov-mirantis)]

Ksenia, I am reassigning that to me because I had a conversation on that topic with Vladimir Eremin and in context of the bug.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/307713
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=92ae4c8e4ed965af91c57e218ef7ffa7fe95db61
Submitter: Jenkins
Branch: master

commit 92ae4c8e4ed965af91c57e218ef7ffa7fe95db61
Author: Vladimir Eremin <email address hidden>
Date: Tue Apr 19 14:10:04 2016 +0300

    Quick logic fix for MTU

    Since Cirros has no proper ping utility, check that 9001 byte packet
    could pass has no sense (ICMP will be fragmented).

    Change-Id: I8501d71491ff72a56116198bbb71e6a262f49efb
    Partial-Bug: #1572079

[Alexandr Kostrikov (akostrikov-mirantis)]

Quick fix is in fuel-qa. Reassigning bug to fuel-qa

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/308287

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/308287
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=62506fde4bc6f66a993ce2a488ff849a6531d4e2
Submitter: Jenkins
Branch: stable/mitaka

commit 62506fde4bc6f66a993ce2a488ff849a6531d4e2
Author: Vladimir Eremin <email address hidden>
Date: Tue Apr 19 14:10:04 2016 +0300

    Quick logic fix for MTU

    Since Cirros has no proper ping utility, check that 9001 byte packet
    could pass has no sense (ICMP will be fragmented).

    Change-Id: I8501d71491ff72a56116198bbb71e6a262f49efb
    Partial-Bug: #1572079
    (cherry picked from commit 92ae4c8e4ed965af91c57e218ef7ffa7fe95db61)

[Atsuko Ito (yottatsa)]

Normal fix is not ready yet.

[Nastya Urlapova (aurlapova)]

Passed on ISO #510: https://product-ci.infra.mirantis.net/job/9.0.system_test.ubuntu.support_dpdk/58/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/8.0
Review: https://review.openstack.org/336483

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/336483
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=e276567c47ba7f5d32b81981ba03d2ce87fd3c8b
Submitter: Jenkins
Branch: stable/8.0

commit e276567c47ba7f5d32b81981ba03d2ce87fd3c8b
Author: Vladimir Eremin <email address hidden>
Date: Tue Apr 19 14:10:04 2016 +0300

    Quick logic fix for MTU

    Since Cirros has no proper ping utility, check that 9001 byte packet
    could pass has no sense (ICMP will be fragmented).

    Change-Id: I8501d71491ff72a56116198bbb71e6a262f49efb
    Partial-Bug: #1572079
    (cherry picked from commit 92ae4c8e4ed965af91c57e218ef7ffa7fe95db61)
    (cherry picked from commit 62506fde4bc6f66a993ce2a488ff849a6531d4e2)