serial shouldn't be used during upgrade and reconfigure

[Jeffrey Zhang]

most of the services are stateful, or depend on database.

it will cause issue when upgrade one of the services with others remain old.
for example if upgrade one nova-api to ocata, it can not read the DB schema successfully. and it can not send message through MQ, because the message struct is different.

On the other hand, if we upgrade the database and upgrade nova-api one by one, it will still cause the same issue.

serial is introduce for smooth upgrading. But apparently, it do not work as expected.

smooth upgrading should be handled by each roles rather than ansible serial feature.

[Paul Bourke (pauldbourke)]

This feels like a blueprint

[Jeffrey Zhang (jeffrey4l)]

but this blocks upgrade from newton to Ocata.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/442974
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=cad7fc35f72b588b28b19198bc0a07669bbb8a39
Submitter: Jenkins
Branch: master

commit cad7fc35f72b588b28b19198bc0a07669bbb8a39
Author: Jeffrey Zhang <email address hidden>
Date: Wed Mar 8 15:04:48 2017 +0800

    Disable running playbooks in serial by default

    Run playbooks in serial are unnecessary and may cause some issue. This
    patch disables serial.

    This patch also removes the serial for MariaDB playbook. MariaDB handle
    this internally.

    Partial-Bug: #1668185
    Change-Id: I3b4216dd82607475e9bd9b44590b631be4abdbdd

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/443228
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=1ae26fac8c2a8839c2f16c618d0ad2423afcf0bc
Submitter: Jenkins
Branch: stable/ocata

commit 1ae26fac8c2a8839c2f16c618d0ad2423afcf0bc
Author: Jeffrey Zhang <email address hidden>
Date: Wed Mar 8 15:04:48 2017 +0800

    Disable running playbooks in serial by default

    Run playbooks in serial are unnecessary and may cause some issue. This
    patch disables serial.

    This patch also removes the serial for MariaDB playbook. MariaDB handle
    this internally.

    Partial-Bug: #1668185
    Change-Id: I3b4216dd82607475e9bd9b44590b631be4abdbdd

[OpenStack Infra (hudson-openstack)]

Change abandoned by Jeffrey Zhang ([e-mail]) on branch: master
Review: https://review.openstack.org/438374