Implement Date Filters for Secrets

[OpenStack Infra]

https://review.openstack.org/338405
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/barbican" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit 55912386d529b4699f5d909271bc398d5254d5bf
Author: Douglas Mendizábal <email address hidden>
Date: Wed Jul 6 12:01:35 2016 -0500

    Implement Date Filters for Secrets

    This CR implements the spec for date filters. The only difference
    between the spec and this CR is the use of the alternative ISO format
    (without the "Z") for specifying the dates. This change was made to
    have a more consistent API since the Zulu designation is not used
    anywhere in the API where dates are shown to the user. Additionaly the
    libraries used for date-time parsing do not make use of the Zulu
    designation either.

    Implements: blueprint date-filters
    DocImpact
    APIImpact

    Change-Id: Ic8fbe3d0e8b309bb192aaddf30291d1333756064