linux gate jobs are broken with ovs-vsctl missing error

[Kevin Benton]

http://logs.openstack.org/12/341212/11/check/gate-tempest-dsvm-neutron-linuxbridge/ff71298/logs/devstacklog.txt.gz

Started after https://review.openstack.org/#/c/343072/ merged.

[Kevin Benton (kevinbenton)]

Fix here: https://review.openstack.org/#/c/345707/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/345820

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/345820
Committed: https://git.openstack.org/cgit/openstack-dev/devstack/commit/?id=7da968a8be03229cfa72b215b87f17e28e23a988
Submitter: Jenkins
Branch: master

commit 7da968a8be03229cfa72b215b87f17e28e23a988
Author: Kevin Benton <email address hidden>
Date: Fri Jul 22 06:02:22 2016 +0000

    Revert "Use real Neutron network for L3 GW by default"

    This reverts commit 130a11f8aaf08ea529b6ce60dd9052451cb7bb5c.
    Linux bridge devstack logic needs some changes first.

    Change-Id: I5885062ad128518c22f743db016e1a6db64f3313
    Closes-Bug: #1605423

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/345707
Committed: https://git.openstack.org/cgit/openstack-dev/devstack/commit/?id=6a42a85b561c35157b14f63ab02536e18e5bb0d9
Submitter: Jenkins
Branch: master

commit 6a42a85b561c35157b14f63ab02536e18e5bb0d9
Author: Kevin Benton <email address hidden>
Date: Thu Jul 21 11:11:54 2016 -0700

    Fixes for linux bridge and Q_USE_PROVIDER_NET

    ===Set bridge_mappings for linux bridge===
    The external network physnet needs a bridge_mapping to the public
    bridge when the L2 agent is responsible for wiring.

    ===Add PUBLIC_PHYSICAL_NETWORK to flat_networks===
    This network must be present in the ML2 flat_networks config if
    flat_networks is specified.

    ===Set ext_gw_interface to PUBLIC_BRIDGE in provider net case===
    ext_gw_interface must be a bridge in a bridge_mapping when
    Q_USE_PROVIDERNET_FOR_PUBLIC is used.

    Closes-Bug: #1605423
    Change-Id: I95d63f8dfd21499c599d425678bf5327b599efcc