Comment 2 for bug 1756363

Reviewed: https://review.openstack.org/553572
Committed: https://git.openstack.org/cgit/openstack/tripleo-upgrade/commit/?id=07e6d2673660ecada04233136c2ee611449c0b0d
Submitter: Zuul
Branch: stable/pike

commit 07e6d2673660ecada04233136c2ee611449c0b0d
Author: Marius Cornea <email address hidden>
Date: Thu Mar 15 14:04:10 2018 -0400

    Remove ceph osd hieradata during upgrade

    Overriding ExtraConfig in an extra environment file is not working
    as expected and stale hieradata is still remaining on the overcloud
    nodes. This removes the hieradata from existing environment file
    instead of overriding ExtraConfig.

    Related-bug: 1756363

    Change-Id: I4915f48b6711add3d6f013c375e08ca1b0d0b22e