Some v2 exceptions raise unicodeError

[Stuart McLaren]

In v2, for some exceptions the exception is not converted to a string properly resulting in:

2014-07-09 15:36:38,714 INFO msg = _("Image exceeds the storage quota: %s") % e
2014-07-09 15:36:38,714 INFO File "glance/openstack/common/gettextutils.py", line 333, in __str__
2014-07-09 15:36:38,714 INFO raise UnicodeError(msg)

in some cases 'utils.exception_to_str' is used to cast the exception.

We should do this in all cases for consistency/to avoid the stack trace

[Nikhil Komawar (nikhil-komawar)]

https://review.openstack.org/#/c/105776/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/105776
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=6b8d72df08e4b70b8de4b9797ae1c03be64e0072
Submitter: Jenkins
Branch: master

commit 6b8d72df08e4b70b8de4b9797ae1c03be64e0072
Author: Stuart McLaren <email address hidden>
Date: Wed Jul 9 15:59:48 2014 +0000

    Some v2 exceptions raise unicodeError

    Use utils.exception_to_str to consistently cast the
    excpetion to avoid the unicodeError stack trace.

    Change-Id: I54fce91c73adca846ec99ed50a57b95d16428ec1
    Closes-Bug: #1339775