"Arguments dropped when creating context" warnings are spamming logs

[Matt Riedemann]

~5.6 million hits in a 7 day gate run:

http://logstash.openstack.org/#eyJzZWFyY2giOiJtZXNzYWdlOlwiQXJndW1lbnRzIGRyb3BwZWQgd2hlbiBjcmVhdGluZyBjb250ZXh0OiB7dSdyZWFkX29ubHknOiBGYWxzZSwgdSdkb21haW4nOiBOb25lLCB1J3Nob3dfZGVsZXRlZCc6IEZhbHNlXCIgQU5EIHRhZ3M6XCJzY3JlZW4tbi1jcHUudHh0XCIiLCJmaWVsZHMiOltdLCJvZmZzZXQiOjAsInRpbWVmcmFtZSI6IjYwNDgwMCIsImdyYXBobW9kZSI6ImNvdW50IiwidGltZSI6eyJ1c2VyX2ludGVydmFsIjowfSwic3RhbXAiOjE0MjYxOTE5NzQyODB9

Probably introduced with the move to oslo_context for the nova RequestContext class.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/164261

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/164261
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a45f24e481751d8b0d2c3e3a7e8f3ee97373f038
Submitter: Jenkins
Branch: master

commit a45f24e481751d8b0d2c3e3a7e8f3ee97373f038
Author: Davanum Srinivas <email address hidden>
Date: Fri Mar 13 12:28:47 2015 -0400

    Stop spamming logs when creating context

    Pass through the rest of the arguments for the oslo_context's
    RequestContext class if they are in our constructor's kwargs.
    This will prevent us from logging them as arguments that we
    drop explicitly.

    Closes-Bug: #1431549
    Change-Id: Ie804a6117accc0e35ef5cfd31360a79636630e21