Comment 20 for bug 1622644

Reviewed: https://review.openstack.org/371455
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=271a4ffd6d700b5d092ff24592ced324ded41e43
Submitter: Jenkins
Branch: master

commit 271a4ffd6d700b5d092ff24592ced324ded41e43
Author: Thomas Morin <email address hidden>
Date: Fri Sep 16 09:46:27 2016 +0200

    OVS: merge the required OpenFlow version rather than replace

    This change modifies the behavior of OVS native and ovs-ofctl bridge
    implementations so that instead of configuring the bridge only for the
    required OVS protocol version, they add the required version to the
    already configured versions.

    To achieve this, an add_protocols method is added to the OVSBridge
    class, relying on the OVSDB add_db_attribute added in
    Ib6ce75846f9b13c1c33f0ced5ccc619ee7860dc1, with the behavior of
    making the provided set of versions supported in addition to already
    configured ones.

    It is aimed to be a cleaner solution to bug 1622644 than the quickfix merge
    from I4475865c4f83cb9f3e12c709af752bc490692ca3 .

    After this change, the set_protocols method appears useless and is
    hence marked for future removal.

    Depends-On: I4386aa293f9b18d2e17b4a80d9c7da4b9b46f3c9
    Change-Id: Id5ac7e6431c97fc70d8404b16f89533b6f270eee
    Related-Bug: 1622644