Remove deprecated releases from openstack.yaml

[Vladimir Kozhukalov]

There is still Centos release in openstack.yaml [1] that looks outdated, also all Ubuntu 14.04 releases [2] in favor to 16.4 are outdated too. Let's delete them.

[1] https://github.com/openstack/fuel-web/blob/bf8f7088e43d967b727708eedbc14274d090ee1c/nailgun/nailgun/fixtures/openstack.yaml#L2036-L2108
[2] https://github.com/openstack/fuel-web/blob/bf8f7088e43d967b727708eedbc14274d090ee1c/nailgun/nailgun/fixtures/openstack.yaml#L2109-L2440

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/365027

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/365110

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/365027
Committed: https://git.openstack.org/cgit/openstack/fuel-web/commit/?id=beb672ce8743a5cab707d81e8b9208c257197971
Submitter: Jenkins
Branch: master

commit beb672ce8743a5cab707d81e8b9208c257197971
Author: Maksim Malchuk <email address hidden>
Date: Fri Sep 2 18:22:20 2016 +0300

    Remove deprecated Ubuntu 14.04 releases

    Change-Id: Ia6504a73d89e3ef7ca79a874ebf2a86beed2b883
    Partial-Bug: #1619027
    Signed-off-by: Maksim Malchuk <email address hidden>

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/365110
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=9e8889d85ea11d02b79f5f7ba25f27ae1f86f08e
Submitter: Jenkins
Branch: master

commit 9e8889d85ea11d02b79f5f7ba25f27ae1f86f08e
Author: Maksim Malchuk <email address hidden>
Date: Fri Sep 2 20:49:45 2016 +0300

    Remove deprecated CentOS 6 and Ubuntu 14.04 code from library

    Depends-On: Ia6504a73d89e3ef7ca79a874ebf2a86beed2b883
    Change-Id: Ibbd4089e505369d7340a05662ecc9cb10852bf02
    Partial-Bug: #1619027
    Signed-off-by: Maksim Malchuk <email address hidden>