Move 'gabbi_tempest_path' to gabbi-tempest plugin

[Ghanshyam Mann]

As discussed in https://bugs.launchpad.net/tempest/+bug/1821072, 'gabbi_tempest_path' var to its original user plugin which is gabbi-tempest.

Comment of bug#1821072

workaround has been merged for this bug to unblock the gate - https://review.openstack.org/#/c/644699/

But we need to move this var to gabbi-tempest plugin jobs side which is the only place it is being used. This var is specific to gabbi-tempest not used for any other devstack-tempest jobs so defining it in devstack-tempest base job is not the correct way. We might face such issue again in future which can end up blocking all gate jobs.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/705340

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/705340
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=9cee53835e96762ec306c6b214e7fddc5941bd58
Submitter: Zuul
Branch: master

commit 9cee53835e96762ec306c6b214e7fddc5941bd58
Author: Ghanshyam <email address hidden>
Date: Sat Feb 1 20:18:56 2020 -0600

    Remove 'gabbi_tempest_path' from devstack-tempest job

    We need to move 'gabbi_tempest_path' var to gabbi-tempest plugin jobs side
    which is the only place it is being used. This var is specific to gabbi-tempest
    not used for any other devstack-tempest jobs so defining it in devstack-tempest
    base job is not the correct way. We might face issue like bug#1821072 again in
    future which can end up blocking all gate jobs.

    Below patch is moving this var to gabbi-tempest plugin.
    - https://review.opendev.org/#/c/705339/

    Change-Id: Id96e9b3f1271fce50aae982fdf12871693107e1d
    Closes-Bug: #1861592

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tempest 26.0.0 release.