Add test on separate haproxy node

[Andrey Sledzinskiy]

Need to create test with next steps:
1. Install Fuel
2. Copy and install external-lb and detach-haproxy plugins
3. Bootstrap 3 slaves from default nodegroup
4. Create cluster with Neutron VXLAN and custom nodegroups
5.Run 'fuel-mirror' to replace cluster repositories
  with local mirrors
6. Bootstrap 2 slaves nodes from second nodegroup
   and one node from third node group
7. Enable plugins for cluster
8. Add 2 controllers from default nodegroup and 1 controller
   from second node group
9. Add 1 compute+cinder from default node group
   and 1 compute+cinder from second node group
10. Add haproxy node from third node group
11. Verify networks
12. Deploy cluster

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/318203
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=7a5970fa64bff6c86b35bf65bcd7222eef7c04c4
Submitter: Jenkins
Branch: master

commit 7a5970fa64bff6c86b35bf65bcd7222eef7c04c4
Author: asledzinskiy <email address hidden>
Date: Tue Apr 12 18:13:16 2016 +0300

    Add test with detached haproxy role

    - Add test with external load balancer. Controllers are
    from different racks and haproxy is from rack-3
    - Separate devops config with appropriate networks
    assigned to nodes is used
    - Local repos for cluster are used because public networks
    are routed without internet connection
    - OSTF isn't running because it's not implied to use
    separate haproxy

    Closes-Bug: #1583530

    Change-Id: I0d3647c8eb13159c27e64ddf5925467f451b610c

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/322012

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/322012
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=f72fe3ea15b52e516bd5a10536eaee547de3b2b5
Submitter: Jenkins
Branch: stable/mitaka

commit f72fe3ea15b52e516bd5a10536eaee547de3b2b5
Author: asledzinskiy <email address hidden>
Date: Tue Apr 12 18:13:16 2016 +0300

    Add test with detached haproxy role

    - Add test with external load balancer. Controllers are
    from different racks and haproxy is from rack-3
    - Separate devops config with appropriate networks
    assigned to nodes is used
    - Local repos for cluster are used because public networks
    are routed without internet connection
    - OSTF isn't running because it's not implied to use
    separate haproxy

    Closes-Bug: #1583530

    Change-Id: I0d3647c8eb13159c27e64ddf5925467f451b610c
    (cherry picked from commit 7a5970fa64bff6c86b35bf65bcd7222eef7c04c4)

[Nastya Urlapova (aurlapova)]

https://product-ci.infra.mirantis.net/job/9.0.system_test.ubuntu.plugins.thread_separate_haproxy/15/testReport/(root)/separate_haproxy/separate_haproxy/