Importing nodes before any images are registered causes the CLI to hang

[Dougal Matthews]

If you run the command "openstack overcloud node import ~/instackenv.json" before registering images in Glance (because it failed or you skipped a step) then the CLI command will hang forver.

The Mistral workflow will actually fail, but this has exposed a bug in Mistral that causes the Workflow to never be marked as errored - it is stuck in the RUNNING state. See: https://bugs.launchpad.net/mistral/+bug/1645295

We should make sure that all error values we pass to the Result class are converted to strings.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/403673
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=0aee2ceb3ca2b26e5271f357b68deca912668f89
Submitter: Jenkins
Branch: master

commit 0aee2ceb3ca2b26e5271f357b68deca912668f89
Author: Dougal Matthews <email address hidden>
Date: Mon Nov 28 12:35:09 2016 +0000

    Convert exceptions to strings when passing them to the Result class

    The Mistral Result class expects the error property to be either a
    string or a dict. Other types, like exceptions, can cause errors in
    mistral which in turn cause a critical failure. See the Mistral bug
    report: https://bugs.launchpad.net/mistral/+bug/1645295

    This change also updates one use of the Result class that doesn't use
    kwargs.

    Change-Id: Ia93f298e5181bae92d7a08468d33c255d38b996a
    Closes-Bug: #1645296

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-common 5.7.0 release.