grenade doesn't load devstack plugin settings for decomposed neutron plugins

[YAMAMOTO Takashi]

grenade assumes definitions like neutron_plugin_configure_common are
available just by sourcing lib/neutron-legacy.
it's ok for ml2 because lib/neutron-legacy sources lib/neutron_plugins/$Q_PLUGIN if available.
however, it doesn't work for decomposed neutron plugins as they don't have the $Q_PLUGIN file in devstack tree.

in case of networking-midonet's devstack plugin,
neutron_plugin_configure_common is defined during "run_phase stack pre-install".

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/477473

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/486778
Committed: https://git.openstack.org/cgit/openstack/networking-midonet/commit/?id=b3913d9709dd4b824d7b4578f15f296f9e1968b8
Submitter: Jenkins
Branch: master

commit b3913d9709dd4b824d7b4578f15f296f9e1968b8
Author: YAMAMOTO Takashi <email address hidden>
Date: Tue Jul 25 07:04:10 2017 +0900

    devstack: Provide functions earlier for grenade

    Closes-Bug: #1700487
    Related-Bug: #1649722
    Change-Id: I2353bdcbe5d9b77fd1d5941bc672d5bab53717ef

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/487278

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/networking-midonet 5.0.0.0b3 development milestone.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/487278
Committed: https://git.openstack.org/cgit/openstack/networking-midonet/commit/?id=e8bf1152daf3d86d506995fb8360d27095fe9519
Submitter: Jenkins
Branch: master

commit e8bf1152daf3d86d506995fb8360d27095fe9519
Author: YAMAMOTO Takashi <email address hidden>
Date: Wed Jul 26 14:09:01 2017 +0900

    gate_hook: Workaround grenade issue for decomposed plugins

    Grenade doesn't work for neutron plugins provided by
    a devstack plugin, like our monolithic plugin.
    (vs devstack in-tree, like ML2)

    I consider this as a temporary solution until it's fixed
    in grenade. [1]

    [1] Iec45a33930a06b17be00e8602f2457ab6960073f

    Related-Bug: #1700487
    Change-Id: I29b47f167783bf0612be942d748de2c7e4c259c0

[Martin Kopec (mkopec)]

Due to a long inactivity moving to Confirmed where we should first verify if this is still an issue (considering it's ~4 years old)