Add Support for TaskFlow Executor

[OpenStack Infra]

https://review.openstack.org/85211
commit a39debfd55f6872e5f4f955b75728c936d1cee4b
Author: Arnaud Legendre <email address hidden>
Date: Thu Sep 4 14:55:53 2014 -0700

    Add Support for TaskFlow Executor

    This patch adds support for a new task executor. This executor
    leverages the taskflow library which is responsible for dispatching
    the tasks.

    The taskflow executor provides basic serial execution of the
    tasks and uses eventlet by default. The execution mode is configurable
    to have parallel execution in which case it is possible to also
    configure the number of workers running at the same time.

    TaskFlow wiki: https://wiki.openstack.org/wiki/TaskFlow

    partially implements bp async-glance-workers
    partially implements bp taskflow-integration

    DocImpact
    UpgradeImpact

    Co-Authored by: Arnaud Legendre <email address hidden>
    Co-Authored by: Flavio Percoco <email address hidden>
    Co-Authored by: Nikhil Komawar <email address hidden>

    Change-Id: Ie31e64f8fee7f9fe7336cde50d5db89577c4f76d

[shailendra acharya (acharyashailendra1)]

can u guide me to solve this bug i want to work over it

[Gauvain Pocentek (gpocentek)]

Hi shailendra,

This bug doesn't require much work, the new configuration options will be picked up and handle buy our automation tools.

[Gauvain Pocentek (gpocentek)]

The new options are listed in the config-ref.