LanguagePack logs don't have 'created_at'

[Priti]

Description: 'app' logs have a 'created_at' field however, 'LanguagePack' logs do not have a 'created_at' field

Steps to reproduce:
solum lp logs java_lp
 +--------------------------------------+-----------------+----------------------------------------------------------------------------------------------------+
| resource_uuid | swift_container | swift_path |
+--------------------------------------+-----------------+----------------------------------------------------------------------------------------------------+
| d7f67fb1-c364-48ff-a3bd-687856e68610 | solum_logs | java_lp-d7f67fb1-c364-48ff-a3bd-687856e68610/languagepack-14931164-8fce-492d-bc6e-d81794cf2b7c.log |
+--------------------------------------+-----------------+----------------------------------------------------------------------------------------------------+

Comparing with:

solum app logs testy
+--------------------------------------+---------------------+-----------------+-------------------------------------------------------------------------------------------+
| resource_uuid | created_at | swift_container | swift_path |
+--------------------------------------+---------------------+-----------------+-------------------------------------------------------------------------------------------+
| b0b6b2ab-604c-49e6-b9ec-e86c65d95e3d | 2015-06-23 18:33:26 | solum_logs | testy-b0b6b2ab-604c-49e6-b9ec-e86c65d95e3d/build-547c9d9c-2d4f-4bcf-8aa6-a41b7920d778.log |
+--------------------------------------+---------------------+-----------------+-------------------------------------------------------------------------------------------+

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/233422

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/233422
Committed: https://git.openstack.org/cgit/openstack/python-solumclient/commit/?id=9edb62e431fbf1ab2706524cb7fc4165ce397783
Submitter: Jenkins
Branch: master

commit 9edb62e431fbf1ab2706524cb7fc4165ce397783
Author: Swati Dewan <email address hidden>
Date: Sun Oct 11 11:52:49 2015 +0530

    Added created_at to language pack logs

    Language pack logs now also show the created_at attribute.

    Change-Id: I299df9660a0b78a592d76b9954950dce49a94a33
    Closes-bug: #1468065