CheckFor task provides insufficient details on failure

[Davide Agnello]

The CheckFor task asserts an error when compared values do not match as expected. This task should accept an optional custom message which can provide additional context on the comparison being executed.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/244308
Committed: https://git.openstack.org/cgit/openstack/cue/commit/?id=1be42880706dd45d15686bc3eabeb58af546bfb0
Submitter: Jenkins
Branch: master

commit 1be42880706dd45d15686bc3eabeb58af546bfb0
Author: dagnello <email address hidden>
Date: Wed Nov 11 12:50:10 2015 -0800

    Adding support for error details on cluster creation

    Cue's current implementation does not provide any additional information
    to the user related to why a cluster went into ERROR state during
    cluster creation. This patch adds error_detail field in the
    clusters table and exposes this field through the API. The
    update_cluster_task now extracts failure flow details and forwards this
    information on cluster record update.

    Partial-Bug: 1508730
    (updates also required to Cue client and dashboard)
    Closes-bug: 1516735
    Change-Id: I440fec30bc3d051189585479b8d2c1219a98cf40