Update AWS sdk to 2.6.15

[helmutschneider]

Tested in conjunction with #9825.

[ghost]

Thanks a lot for your contribution! Contributions to the core repo require a signed contributors agreement http://owncloud.org/contribute/agreement/ Alternatively you can add a comment here stating that this contribution is MIT licensed. Some more details about out pull request workflow can be found here: http://owncloud.org/code-reviews-on-github/

[helmutschneider]

MIT

[th3fallen]

@owncloud-bot ok to test

[DeepDiver1975]

@helmutschneider can you please have a look at the changed file permissions

 100644 → 100755

THX

[helmutschneider]

@DeepDiver1975 Sorry, fixed.

[scrutinizer-notifier]

A new inspection was created.

[PVince81]

@owncloud-bot ok to test

[ghost]

🚀 Test Passed. 🚀
Refer to this link for build results: https://ci.owncloud.org/job/pull-request-analyser/7078/

[Niduroki]

Did a quick test of:

• Adding and removing a bucket
• Renaming a file
• Down/Uploading a file
• Removing a file
• (Un)Sharing a file

And everything worked fine (Chromium 38.0.2125.44 - not that it matters).

👍 from me

[LukasReschke]

3rdparty matches upstream => 👍

[AdamWill]

@helmutschneider in case you're feeling like another update, I've been testing OC 8 (git master) with upstream 2.7.12 of the AWS lib and in some quick tests it seems fine.

[helmutschneider]

@AdamWill unless there are critical fixes I am reluctant to update it before 3.0 arrives. Too much manual work :)