Remove VirtualBox, MSFTOCS and SeaMicro drivers

[Ruby Loo]

These drivers have been unsupported since Newton. There aren't any third-party CIs for them and we are unaware of any plans for any CIs in the future. According to Ironic's third-party driver policy [1], they should be removed.

[1] https://specs.openstack.org/openstack/ironic-specs/specs/not-implemented/third-party-ci.html

[Pavlo Shchelokovskyy (pshchelo)]

patch proposed at https://review.openstack.org/#/c/431205

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/431205
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=02ce7246ecb20daae3883a45099434caa13a7f08
Submitter: Jenkins
Branch: master

commit 02ce7246ecb20daae3883a45099434caa13a7f08
Author: Pavlo Shchelokovskyy <email address hidden>
Date: Thu Feb 9 00:32:40 2017 +0200

    Remove most unsupported drivers

    In accordance with ironic CI policies, this patch removesi some drivers
    that are not tested on upstream or third-party CI
    and for which maintainers have not communicated any plans
    to have such testing.

    This includes:
    - virtualbox drivers
    - seamicro drivers
    - msftocs drivers

    Change-Id: Ia3a7d798c877f4628946ee6c56d850b9847e6c3e
    Closes-Bug: #1663018

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/ironic 7.0.0 release.