[tripleoclient] Getting a file checksum results in an infinite loop in py34

[Juan Antonio Osorio Robles]

While the function file_checksum which is in tripleoclient/utils.py works for python 2.7. If you run the same function on a file it ends up in an infinite loop in Python 3.4

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/228608

[Steven Hardy (shardy)]

Getting a py34 check job in place to ensure we keep things working for python 3 would be a good idea.

[Juan Antonio Osorio Robles (juan-osorio-robles)]

I proposed a commit to get python 3X jobs in the gate https://review.openstack.org/#/c/228855/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/228608
Committed: https://git.openstack.org/cgit/openstack/python-tripleoclient/commit/?id=24d57b674329b40788d365810c7b2cdf8d1eb255
Submitter: Jenkins
Branch: master

commit 24d57b674329b40788d365810c7b2cdf8d1eb255
Author: Juan Antonio Osorio Robles <email address hidden>
Date: Mon Sep 28 23:18:48 2015 +0300

    Fix file checksum function in for python 3.4

    The file_checksum function in tripleoclient/utils.py resulted in an
    infinite loop in py34 due to the fact that that function was expecting
    an empty character to finish the iteration. This is no longer the case
    in py34. So instead, we now iterate the file until it can no longer read
    anything. Even though it's more verbose; this works for both python 2.7
    and 3.4.

    Change-Id: I4849182992cac1209431a2147a83c9167d6a8af2
    Closes-Bug: #1500592