NSX: Add support for L2 gateway

[Abhishek Raut]

Add support for L2 gateway with NSX plugins.

1. Support for L2 gateway with NSX-T
2. Support for L2 gateway with NSX-V

Integrate networking-l2gw APIs with NSX as a service plugin with respective backend drivers.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/208672

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/210623

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/208672
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=e760c30a6f89f4f951d52fd40e18513928c9d97d
Submitter: Jenkins
Branch: master

commit e760c30a6f89f4f951d52fd40e18513928c9d97d
Author: Abhishek Raut <email address hidden>
Date: Sat Aug 1 01:13:22 2015 -0700

    Add support for L2 gateway service plugin

    This patch adds the service plugin module which integrates the
    networking-l2gw APIs with NSX. This module is the common framework
    for the Layer 2 gateway support for NSX-T and NSX-V backends.
    The corresponding backend drivers will be controlled via the config
    parameter introduced here. This parameter will be configured with the
    class path to the backend driver. Backend drivers will be responsible
    for adding backend-specific logic. The corresponding backend drivers
    for NSX-T and NSX-V will be addressed in separate follow up patches.

    Change-Id: If997df17a1379a3775d29c1377f0f4e1ce9be328
    Partial-bug: #1481087

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/220612

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/210623
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=06363890eee4f42ce09cbdb0908b9e2f50e1ea02
Submitter: Jenkins
Branch: master

commit 06363890eee4f42ce09cbdb0908b9e2f50e1ea02
Author: Abhishek Raut <email address hidden>
Date: Thu Aug 6 12:09:06 2015 -0700

    NSXv3: Add backend driver for Layer 2 gateway

    This patch adds the backend driver to support Layer 2 gateway
    API calls for NSXv3.

    Change-Id: Iec1e143115579cca6c8158188217ead4209959bd
    Partial-bug: #1481087

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/214488
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=0fc47eabf5656a8753270d8ac4a048b66deb7ef1
Submitter: Jenkins
Branch: master

commit 0fc47eabf5656a8753270d8ac4a048b66deb7ef1
Author: Zhenmei <email address hidden>
Date: Tue Aug 11 07:18:16 2015 +0800

    NSXv driver for Layer 2 gateway

    This patch adds the backend driver to support Layer 2 gateway
    API calls for NSXv.

    Partial-bug: #1481087

    Change-Id: Iea8b5390300dfd653b275c4389bc0d12bc4cc59f

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/220612
Committed: https://git.openstack.org/cgit/openstack/vmware-nsx/commit/?id=78bc42dc098da0068feb4f7c3ceea21be7192275
Submitter: Jenkins
Branch: master

commit 78bc42dc098da0068feb4f7c3ceea21be7192275
Author: Abhishek Raut <email address hidden>
Date: Tue Aug 18 06:50:15 2015 -0700

    NSXv3: Add more unit tests for layer 2 gateway support

    Change-Id: I7611117b39f68001526c3a1b18d0709f96a6ffa9
    Partial-bug: #1481087