Comment 3 for bug 1738276

Reviewed: https://review.openstack.org/528124
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=97185448b307cea98a2e2f11337df4950e76b95d
Submitter: Zuul
Branch: master

commit 97185448b307cea98a2e2f11337df4950e76b95d
Author: John Fulton <email address hidden>
Date: Thu Dec 14 18:20:24 2017 -0500

    Parameterize Ansible environment vars in Mistral Workflow

    Add ansible_env_variables which a user may use to override
    any Ansible environment variable. This new parameter is
    then merged with the default env variables as set in
    ansible_extra_env_variables.

    Also adds DEFAULT_FORKS to the default env variables
    with a new default of 50. Ansible automatically limits
    the number of forks to the number of possible hosts at
    runtime so it is not necessary to compute the fork count.

    Change-Id: I5d69af146ca6ca8b3d5f78445cd1b47828daa955
    Partial-Bug: 1738276