Fix bad performance when editing project

[Doug Fish]

Closely related to bug #1278920. Basically the same problem occurs in the Edit Project action. (UpdateProject.handle). There is an API call to get the role for each user, which doesn't scale. The same keystone client addition from #1278920 (get_project_users_roles) can be used here as well.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/119487

[OpenStack Infra (hudson-openstack)]

Change abandoned by David Lyle (<email address hidden>) on branch: master
Review: https://review.openstack.org/119487
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/119487
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=dad9791640ddebff9634b1dffb774d173921ac78
Submitter: Jenkins
Branch: master

commit dad9791640ddebff9634b1dffb774d173921ac78
Author: Doug Fish <email address hidden>
Date: Tue Mar 17 12:29:16 2015 -0500

    Fix bad performance on project update panel

    Modify the Edit Project action use get_project_user_roles API
    instead of making a separate call for each user.

    The get_project_user_roles API which enables this improvement
    is new in Keystone V3. Improved performance will be seen only
    when using Keystone V3.

    Change-Id: I204f25800abcbc35a130d351431c938b01c72d18
    Closes-bug: #1365685

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/177005
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=1ccc4dd14adfe85946ff87529db144330cac53ae
Submitter: Jenkins
Branch: master

commit 1ccc4dd14adfe85946ff87529db144330cac53ae
Author: Jingjing Ren <email address hidden>
Date: Mon Apr 20 01:16:05 2015 +0000

    Fix bad performance when editing domain members

    Modify the Edit action use get_domain_user_roles API
    instead of making a separate call for each user.

    Change-Id: I9a37cf0d74b8a5ef6e1a6d4013a2b6826649f0c2
    Related-Bug: #1365685
    Closes-Bug: #1445249