Restart metadata proxy will make the existing openflow not be usable

[Hong Hui Xiao]

Restarting the metadata proxy will destroy and rebuild a tap-metadata port. This will change the ofport num of the tap-metadata port. As a result, the existing openflow will not be usable as the in_port changed.
Restart the df-controller will rebuild the openflow which can be a workaround.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/361551

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/361551
Committed: https://git.openstack.org/cgit/openstack/dragonflow/commit/?id=19232467d6ee047c482d384b5c685ad5141184ad
Submitter: Jenkins
Branch: master

commit 19232467d6ee047c482d384b5c685ad5141184ad
Author: Hong Hui Xiao <email address hidden>
Date: Sat Aug 27 12:02:56 2016 +0800

    Use ovs db notification to update metadata flows

    This patch will use the notification from ovs db to update/delete
    the OpenFlows for metadata service. So that when metadata proxy
    restarts, the latest information can be upadted in OpenFlow. And thus,
    the vm can still use metadata even if the metadata proxy restarts.

    Change-Id: Idaf3060d80a95b210ca4934bd9b3ab29a7c6fe5a
    Closes-bug: #1613615

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/371845

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/371845
Committed: https://git.openstack.org/cgit/openstack/dragonflow/commit/?id=d937cd36da98fbab1e8f66c3861cd2ff73c0889e
Submitter: Jenkins
Branch: master

commit d937cd36da98fbab1e8f66c3861cd2ff73c0889e
Author: Hong Hui Xiao <email address hidden>
Date: Sat Sep 17 09:41:23 2016 +0800

    Downgrade the log level for Unknown port online/offline

    This error can be observed when metadata port up/down. The up/down of the
    port out of topology should not be error, which will be noticed by user.

    It should be something noticed by admin.

    Change-Id: Ib76ddbfc2c8fefe8ac051d14b2a29888c03483da
    Related-Bug: #1613615