Improve error message when sync actions timeout

[Thomas Herve]

I run the following call on a mistral env:

$ mistral run-action std.sleep '{"seconds": 120}'
ERROR (app) MessagingTimeout: Timed out waiting for a reply to message ID 57979027948c4ed888a14a11519f99e8

I don't expect the call to work, as sync actions are inherently limited, but it'd be nice to have a more clear error message, so that it doesn't appear to be an infrastructure issue.

[int32bit (int32bit)]

So should we have any idea to exactly distinguish whether the exception is really an infrastructure issue or execution timeout ?

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/510456

[OpenStack Infra (hudson-openstack)]

Change abandoned by int32bit (<email address hidden>) on branch: master
Review: https://review.openstack.org/510456

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/673298
Committed: https://git.openstack.org/cgit/openstack/mistral/commit/?id=babcd0d6831b4596ce3f392990aecefc60ae7193
Submitter: Zuul
Branch: master

commit babcd0d6831b4596ce3f392990aecefc60ae7193
Author: Eyal <email address hidden>
Date: Mon Jul 29 17:20:08 2019 +0300

    Improve error message when sync actions timeout

    Make the exception in case of a MessageTimeout to
    be something more clear

    Change-Id: I69c32f1a6fc34cd3c0c843e847cb190c2fa53010
    Closes-bug: #1721571

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/mistral 9.0.0.0b1 development milestone.