better handling of errors in to_json parsed tasks

[Michał Jastrzębski]

for example, when deploying ceph, task "Fetching Ceph keyrings" fail because of docker problem, ansible shows "failed to parse json" error instead completely overwriting original error

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/268798

[OpenStack Infra (hudson-openstack)]

Change abandoned by Qiu Yu (<email address hidden>) on branch: master
Review: https://review.openstack.org/268798

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/268333
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=20c0f4c3f166a800f6a4bc4cf1d740932090b3ed
Submitter: Jenkins
Branch: master

commit 20c0f4c3f166a800f6a4bc4cf1d740932090b3ed
Author: Qiu Yu <email address hidden>
Date: Fri Jan 15 13:41:41 2016 -0700

    Fix ceph-mon existing cluster detection logic

    After moving from data container to named volumes, ceph monmap detection
    is broken. This change fix the logic by leverage kolla_docker's
    idempotency creating a named volume.

    Change-Id: Iabc2e2fe5f526e1a6fc2e1b1158d1702aaf4bdf9
    Related-Bug: #1533368

[Michał Jastrzębski (inc007)]

Since no movement since Jan, I'll unassign it. Let me know Qiu if you want to have it reassigned

[Jeffrey Zhang (jeffrey4l)]

This is an automated cleanup. This bug report has been closed because it
is older than 18 months and there is no open code change to fix this.
After this time it is unlikely that the circumstances which lead to
the observed issue can be reproduced.

If you can reproduce the bug, please:
* reopen the bug report (set to status "New")
* AND add the detailed steps to reproduce the issue (if applicable)
* AND leave a comment "CONFIRMED FOR: <RELEASE_NAME>"
  Only still supported release names are valid (OCATA, PIKE, QUEENS, ROCKY, ROCKY).
  Valid example: CONFIRMED FOR: OCATA