Switch to CentOS-7.2.1511

Registered by Dmitry Teselkin

We're building our ISO from outdated CentOS-7.1.1503 release that isn't receive any updates since 7.2 released. We need to switch to 7.2 to get up-to-date packages. This change requires the following:
* update ISO build system to use 7.2 package repositories
* add snapshots for 7.2 to be able to revert if any issues
* create transition plan to be able to switch CI to next (7.3) release later

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Dmitry Teselkin
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/switch-to-centos-7,n,z

Addressed by: https://review.openstack.org/280338
    Switch to CentOS-7.2 spec

Gerrit topic: https://review.openstack.org/#q,topic:bp/switch-to-centos-7-2,n,z

Addressed by: https://review.openstack.org/287345
    Disable TSO offloading by default

Gerrit topic: https://review.openstack.org/#q,topic:(detached,n,z

Addressed by: https://review.openstack.org/284027
    Revert "Revert "Use current CentOS when building ISO""

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Work Items

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