Comment 2 for bug 1539118

Reviewed: https://review.openstack.org/273594
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=8c8704e23a4ab3d0bae8a21fd5bef8a97c9c5f13
Submitter: Jenkins
Branch: master

commit 8c8704e23a4ab3d0bae8a21fd5bef8a97c9c5f13
Author: Yuriy Zveryanskyy <email address hidden>
Date: Thu Jan 28 16:39:21 2016 +0200

    Fix spawn error hook in "continue_node_clean" RPC method

    1) utils.cleaning_error_handler() as hook in current code does not
    have an exception parameter that task context manager adds.
    2) It's not needed to set fail state on "NoFreeConductorWorker"
    exception, this is driver specific. IPA driver can obtain a free
    worker on the next heartbeat(s).

    This patch also adds missing tests for error handlers functions.

    Closes-Bug: #1539118
    Change-Id: I9081d5b3437e9be6b68fe9c635b38f84637e93df