Manager Exceptions aren't properly handled by API

[Sylvain Bauza]

Climate (and other) Exceptions are thrown to the API thanks to AMQP but are not properly catched because the resulting exception is not inheriting from ClimateException, but rather Oslo's RemoteError

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/63445

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/63445
Committed: https://git.openstack.org/cgit/stackforge/climate/commit/?id=b35935753b5998c2e0633f1708d71a29d166f276
Submitter: Jenkins
Branch: master

commit b35935753b5998c2e0633f1708d71a29d166f276
Author: Sylvain Bauza <email address hidden>
Date: Fri Dec 20 17:17:16 2013 +0100

    Fix Manager exceptions rendering for end-users

    Manager Exceptions were not properly catched by API, so consequently
    placed them all in one global Manager exceptions file and parsing
    it for knowing if it's a Climate Exception

    Also partially fixes #1257204

    Closes-Bug: #1263116

    Partial-Bug: #1257204

    Change-Id: Ic488ceab6ea6bed1ae2b1528e08810edfffde5be
    Implements: bp: