Comment 7 for bug 1842754

Reviewed: https://review.opendev.org/680773
Committed: https://git.openstack.org/cgit/openstack/python-tripleoclient/commit/?id=10e861e08004ce5f56b6aba40eb3ae20d8ea8e68
Submitter: Zuul
Branch: stable/queens

commit 10e861e08004ce5f56b6aba40eb3ae20d8ea8e68
Author: Alex Schultz <email address hidden>
Date: Thu Sep 5 10:04:03 2019 -0600

    Add exclusions to the unused param warning

    This adds the ability for us to specifically exclude some patterns of
    parameters from the warning that is generated during the deployment for
    unused heat params. The params being added are generated by the
    deployment and not necessarily provided by the end user. The params
    currently being excluded are:

     * '^(Docker|Container).*Image$' - container image vars
     * '^SwiftFetchDir(Get|Put)Tempurl$' - temp url for ceph
     * '^PythonInterpreter$' - python executable for the deploy

    The warning message is also slightly adjusted to try and clarify that
    the vars might be valid but not used due to service or deployment
    configs.

    Conflicts:
     tripleoclient/constants.py
     tripleoclient/workflows/parameters.py

    Change-Id: Iad7d97346993b5c95443092b81d056293cdad752
    Closes-Bug: #1842754
    (cherry picked from commit b25a9a953bfe6923cb855ca22e4f84e620241956)