Skipping test on NotImplementedError is unsafe

[Julien Danjou]

Skipping test when NotImplementedError is raised is dangerous as any Python module used in a storage driver could raise it. If that's the case, the test will be skipped rather than marked as failing.

[Lianhao Lu (lianhao-lu)]

https://review.openstack.org/#/c/121518/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/121518
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=62008d4e5bf688024c0be575ee37df20b82bb722
Submitter: Jenkins
Branch: master

commit 62008d4e5bf688024c0be575ee37df20b82bb722
Author: Julien Danjou <email address hidden>
Date: Mon Sep 15 12:07:04 2014 +0200

    Switch to a custom NotImplementedError

    Some drivers/modules might raise NotImplementedError whereas we would
    expect things to work. Skipping test when such an error is raised would
    be a bad idea, we would know the test failed.
    So let's switch to a custom NotImplementedError and let's skip test only
    if this one is raised.

    Closes-Bug: #1369556

    Change-Id: Ie88a281787218f9aba13b6e662eb4d49d3e685d0