increase default setting of workers to n-cpu

[Morgan Fainberg]

Eventlet workers should default to n-cpu not 1 for both main and admin APIs. The default of 1 with UUID tokens causes eventlet to perform extremely poorly under a default installation.

It is possible the minimum default should always be 2 workers. (Open for discussion)

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/122484

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/122485

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/122484
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=2521962e395b1325f80b532efc51c1d6d6fb4162
Submitter: Jenkins
Branch: master

commit 2521962e395b1325f80b532efc51c1d6d6fb4162
Author: Morgan Fainberg <email address hidden>
Date: Thu Sep 18 10:51:00 2014 -0700

    Add the processutils from oslo-incubator.

    This is a module specific add rather than a full sync. The processutils
    module will be used to determine the default number of workers for keystone
    running under eventlet.

    Processutils sync'd from oslo commit hash 6a60f84258

    Change-Id: I6cbca7d54ca97cce962d3cc1131388840ddf9a7c
    Related-Bug: #1371154

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/122485
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=09b717c04bb9d0a91da91352d5903daed5c75b36
Submitter: Jenkins
Branch: master

commit 09b717c04bb9d0a91da91352d5903daed5c75b36
Author: Morgan Fainberg <email address hidden>
Date: Thu Sep 18 11:02:31 2014 -0700

    Set the default number of workers when running under eventlet

    Keystone now defaults to n-cpu as the number of workers under eventlet with
    a minimum number of workers when auto-calculating the number of 2.

    This behavior can be overridded by changing the `admin_workers` and
    `public_workers` configuration values in the Keystone config file.

    Change-Id: I482cfef7ee14e995c6fb206bcef412957c54f491
    Closes-Bug: #1371154