[upgrade] Dump tack timed out after upgrade 7-8 master node

[Vladimir Khlyunev]

Reproduced several times on CI - latest https://custom-ci.infra.mirantis.net/view/All/job/custom.upgrade_system_test/21/console

After restore procedure generation of diag.snapshot is failing by unknown reasons. We should investigate this;

Steps to reproduce:
1 - Deploy 7.0 Fuel + 7.0 cluster
2 - Upgrade to 8.0
3 - Generate diag.snapshot

Expected result: snapshot is generated and available
Actual result: Waiting task "dump" timeout 600 sec was exceeded

[Bug Checker Bot (bug-checker)]

(This check performed automatically)
Please, make sure that bug description contains the following sections filled in with the appropriate data related to the bug you are describing:

version

For more detailed information on the contents of each of the listed sections see https://wiki.openstack.org/wiki/Fuel/How_to_contribute#Here_is_how_you_file_a_bug

[Sergey Abramov (sabramov)]

The main reason of this bug is encode problem during sending message to nailgun.
Then message dumps to json, it's required to be converted to utf-8.
Default encoding is ASCII-8bit, than it's converted to json it raise an error and don't send message to nailgun. That's why task never ends.

[Sergey Abramov (sabramov)]

https://review.openstack.org/#/c/341593/

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sergey Abramov (<email address hidden>) on branch: master
Review: https://review.openstack.org/341593