change ctxt to context to keep consistent

[Guangya Liu (Jay Lau)]

Please check https://review.openstack.org/#/c/151579/1/magnum/db/sqlalchemy/api.py for detail

it will be great if replace name ctxt with context, this follows naming convention in all files.

[Davanum Srinivas (DIMS) (dims-v)]

fixing in https://review.openstack.org/#/c/153762/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/153762
Committed: https://git.openstack.org/cgit/stackforge/magnum/commit/?id=8a109e562b868448f5ef6eca425c9a769e6003de
Submitter: Jenkins
Branch: master

commit 8a109e562b868448f5ef6eca425c9a769e6003de
Author: Davanum Srinivas <email address hidden>
Date: Fri Feb 6 22:58:30 2015 -0500

    Change ctxt to context to for consistency

    rename ctxt in all files under db/

    Partial-Bug: #1416922
    Change-Id: I41dd3ad26c20791861d443ae9e52c1237a73495b

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/153912

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/153912
Committed: https://git.openstack.org/cgit/stackforge/magnum/commit/?id=6a840102533bf14dbcfbb3c9cf992e9b62c48cab
Submitter: Jenkins
Branch: master

commit 6a840102533bf14dbcfbb3c9cf992e9b62c48cab
Author: Davanum Srinivas <email address hidden>
Date: Sun Feb 8 21:56:25 2015 -0500

    Change ctxt to context to for consistency

    rename ctxt in all files under magnum/

    Closes-Bug: #1416922
    Change-Id: I28870d1381bd7107d431d5d3c76ad636f6d1d90a