compute manager update_available_resource interval needs to be configurable

[Terry Yao]

nova compute manager.update_available_resource() periodic task is not configurable for it's interval. For some case, there might be multiple compute services in one process, so there will be multiple periodic tasks were running in a process, and cpu cycles are mostly occupied by this periodic task as it will also get the resource to the virtualization layer.

It's better to expose this periodic task to be configurable.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/133904

[OpenStack Infra (hudson-openstack)]

Change abandoned by Qin Zhao (<email address hidden>) on branch: master
Review: https://review.openstack.org/133904

[Markus Zoeller (markus_z) (mzoeller)]

Cleanup
=======

There are no open reviews for this bug report since more than 2 weeks.
To signal that to other contributors which might provide patches for
this bug, I switch the status from "In Progress" to "Confirmed" and
remove the assignee.
Feel free to add yourself as assignee and to push a review for it.

[Markus Zoeller (markus_z) (mzoeller)]

This wishlist bug has been open a year without any activity. I'm going
to move it to "Opinion / Wishlist", which is an easily-obtainable queue
of older requests that have come on. If you decide to work on this
consider using a blueprint [1] (maybe with a spec [2]). I'll recommend to
read [3] if not yet done.

References:
[1] https://blueprints.launchpad.net/nova/
[2] https://github.com/openstack/nova-specs
[3] https://wiki.openstack.org/wiki/Blueprints