oslo-config-generator returns Ok when error appeared

[Valeriy Ponomaryov]

oslo-config-generator is used to generate config sample iterating all entry points provided to it.

But if some error appears, return code will be absent.

It is critical to have it running in CI.

See result of error In Manila project:

http://logs.openstack.org/50/139850/17/check/gate-manila-tox-genconfig/76129bd/console.html#_2015-02-07_10_16_08_488

Error exists but job passed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/153863

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/153863
Committed: https://git.openstack.org/cgit/openstack/oslo.config/commit/?id=b392cf18914b9ee9ab983099398e33551dc92da3
Submitter: Jenkins
Branch: master

commit b392cf18914b9ee9ab983099398e33551dc92da3
Author: vponomaryov <email address hidden>
Date: Tue Feb 24 09:11:31 2015 +0200

    Add exception handling for entry points

    oslo-config-generator is used to generate config sample iterating all
    entry points provided to it.
    But if some error appears, return code will be absent.
    It is critical to have it running in CI.
    So, add new func that will be used for error handling and provide it
    to stevedore that suppresses all errors by default.

    Change-Id: Ia78cc0d4e8ab842cd0e279713badd68606a67a58
    Closes-Bug: #1419458