Verify ML2 type driver exists before calling del

[OpenStack Infra]

https://review.openstack.org/85592
commit af89d74d2961db6a04572375150ad908c9e72e78
Author: Kevin Benton <email address hidden>
Date: Sun Apr 6 04:57:36 2014 -0700

    Verify ML2 type driver exists before calling del

    Verifies that an ML2 type driver exists for a given
    segment type before attempting to call the release_segment
    method on it. Logs an error if a type driver is not
    found.

    This covers the case where a segment is created with
    a given type and then ML2 is reconfigured without
    support for that type.

    DocImpact
    The ML2 documentation should be updated with a warning
    that disabling a network type driver and re-enabling
    it later may lead to possible DB inconsistencies.

    Closes-Bug: #1292102
    Change-Id: I65a35abf3ed57347bb6e8fee228f8c0697217c00

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: master
Review: https://review.openstack.org/89467

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/89467
Committed: https://git.openstack.org/cgit/openstack/openstack-manuals/commit/?id=34ba08d78934431ab26ec8c529bb203eb1ea2420
Submitter: Jenkins
Branch: master

commit 34ba08d78934431ab26ec8c529bb203eb1ea2420
Author: Martin Lopes <email address hidden>
Date: Tue Apr 22 13:46:00 2014 +1000

    Adds warning for disabling ML2 types

    Adds warning that disabling a network type driver and re-enabling it
    again later may lead to database inconsistencies under a specific
    configuration.

    Change-Id: I51a2a1a0114a2b42af37cbbb07d36dd4a298559b
    Closes-Bug: 1307133

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/openstack-manuals 15.0.0 release.