"_associate_qos_spec.html" url is wrong

[qiaomin032]

Reproduce the bug:
1, Open admin volume_type panel, and create a volume type;
2, Right click the "Manage QoS Spec Association" button in the table action and open a new page.
3, There will cast TemplateDoesNotExist error.

Because the "_associate_qos_spec.html" url in "associate_qos_spec.html" is wrong, so there will cast TemplateDoesNotExist error.

please see the attachment for more detail.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/218704

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/218704
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=ddf66da8ad25ad2d6527b62932d2ad88398f4f56
Submitter: Jenkins
Branch: master

commit ddf66da8ad25ad2d6527b62932d2ad88398f4f56
Author: chenqiaomin <[e-mail]>
Date: Wed Jul 8 13:41:28 2015 -0400

    Correct the wrong url in "Manage QoS Spec Association"

    The "_associate_qos_spec.html" url in "associate_qos_spec.html" is
    wrong, so there will cast TemplateDoesNotExist error. This patch
    Correct the wrong url.

    Change-Id: I757f75136018f85dec41ac4d813945748658ecec
    Closes-Bug: #1490366