Check in "_update_segmentation_id" that the mech_driver has an agent

[Rodolfo Alonso]

In [1] it is assumed that all mechanism drivers have an agent, but the mech driver API [2] doesn't enforce it. An additional check must be done in order to retrieve the "agent_type" instance variable.

[1] https://review.openstack.org/#/c/633165/20/neutron/plugins/ml2/plugin.py@814
[2] https://github.com/openstack/neutron-lib/blob/stable/stein/neutron_lib/plugins/ml2/api.py#L37

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/651878

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/655347

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/651878
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=749b33e41bc905a3bec9d356c78a477e9b8aa87d
Submitter: Zuul
Branch: master

commit 749b33e41bc905a3bec9d356c78a477e9b8aa87d
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Thu Apr 11 12:49:20 2019 +0000

    Check in "_update_segmentation_id" that the mech_driver has an agent

    In [1] it is assumed that all mechanism drivers have an agent, but the
    mech driver API [2] doesn't enforce it. VIF types will be retrieved
    only from those mechanism drivers with an associated agent.

    [1]https://review.openstack.org/#/c/633165/20/neutron/plugins/ml2/plugin.py@814
    [2]https://github.com/openstack/neutron-lib/blob/stable/stein/neutron_lib/plugins/ml2/api.py#L37

    Change-Id: I5c334f31259871ed5251d5d4a2ba8cae36bd2355
    Closes-Bug: #1824346

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 15.0.0.0b1 development milestone.