Fix l2 gateway drivers based on upstream changes

[Abhishek Raut]

Upstream commit broke nsx-v and nsx-v3 l2gw drivers.

[Tong Liu (liutong)]

This has been fixed the following patch:
https://review.openstack.org/#/c/324966/

We also need to back port it to stable/mitaka as it is broken there too.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/324966
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=6080794f949c1ca53f28e0ff6a43f308e4fce7bc
Submitter: Jenkins
Branch: master

commit 6080794f949c1ca53f28e0ff6a43f308e4fce7bc
Author: Abhishek Raut <email address hidden>
Date: Sun May 8 08:57:25 2016 -0700

    [NSXv3]: Refactor v3 L2 Gateway driver

    Commit Ib56ee8bfd182c031e468c503acb0cd75daea8c40 refactored code
    in L2 gateway base plugin. This patch makes appropriate changes
    in NSX plugin and v3 driver.

    Change-Id: I45d546e59e99d49d2a9b18258af94d90e91333ca
    Partial-Bug: #1591413

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/328648

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/328648
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=fe269163db36afa48889fd514b15b524b3dc0e2c
Submitter: Jenkins
Branch: stable/mitaka

commit fe269163db36afa48889fd514b15b524b3dc0e2c
Author: Abhishek Raut <email address hidden>
Date: Sun May 8 08:57:25 2016 -0700

    [NSXv3]: Refactor v3 L2 Gateway driver

    Commit Ib56ee8bfd182c031e468c503acb0cd75daea8c40 refactored code
    in L2 gateway base plugin. This patch makes appropriate changes
    in NSX plugin and v3 driver.

    Conflicts:
     vmware_nsx/services/l2gateway/nsx_v3/driver.py
     vmware_nsx/tests/unit/services/l2gateway/test_nsxv3_driver.py

    Change-Id: I45d546e59e99d49d2a9b18258af94d90e91333ca
    Partial-Bug: #1591413
    (cherry picked from commit 6080794f949c1ca53f28e0ff6a43f308e4fce7bc)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/331896

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/331896
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=ecbed5d94068939712bd5ddf8b22efb7d60b4d32
Submitter: Jenkins
Branch: master

commit ecbed5d94068939712bd5ddf8b22efb7d60b4d32
Author: Abhishek Raut <email address hidden>
Date: Wed May 11 15:24:56 2016 -0700

    [NSX|V|V3]: Refactor NSX-V L2 Gateway driver

    Commit Ib56ee8bfd182c031e468c503acb0cd75daea8c40 refactored code
    in L2 gateway base plugin. This patch removes unused NSX plugin
    code and makes appropriate changes to NSX-V driver.

    This patch also adds a couple of update_l2_gateway methods to
    both NSX|V and NSX|V3 L2GW drivers. These methods are added
    since the base plugin expects the driver to define them.

    Change-Id: Ifda5401ec5134268b8a9c3276ed7abf4cf8874aa
    Partial-Bug: #1591413

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/336285

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/336285
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=2735c086815886c3c4eea98bf018ca6be53772e0
Submitter: Jenkins
Branch: stable/mitaka

commit 2735c086815886c3c4eea98bf018ca6be53772e0
Author: Abhishek Raut <email address hidden>
Date: Wed May 11 15:24:56 2016 -0700

    [NSX|V|V3]: Refactor NSX-V L2 Gateway driver

    Commit Ib56ee8bfd182c031e468c503acb0cd75daea8c40 refactored code
    in L2 gateway base plugin. This patch removes unused NSX plugin
    code and makes appropriate changes to NSX-V driver.

    This patch also adds a couple of update_l2_gateway methods to
    both NSX|V and NSX|V3 L2GW drivers. These methods are added
    since the base plugin expects the driver to define them.

    Change-Id: Ifda5401ec5134268b8a9c3276ed7abf4cf8874aa
    Partial-Bug: #1591413
    (cherry picked from commit ecbed5d94068939712bd5ddf8b22efb7d60b4d32)