Comment 2 for bug 1807630

Reviewed: https://review.openstack.org/623971
Committed: https://git.openstack.org/cgit/openstack/shaker/commit/?id=3d1d37b96a2153efbd01d2962bc164acf009e266
Submitter: Zuul
Branch: master

commit 3d1d37b96a2153efbd01d2962bc164acf009e266
Author: Sphicas, Phil (ps3910) <email address hidden>
Date: Sun Dec 9 18:01:31 2018 -0800

    Add support for best-effort accommodations

    Adds a new accommodation instruction 'best_effort' that allows the
    deployment to proceed even if the number of available compute nodes
    is less than what was requested.

    For example, this will create a single pair of agents on separate
    compute nodes if possible, but will fall back to creating them on
    the same compute node if only one is available:

    accommodation: pair, single_room, best_effort, compute_nodes: 2

    Change-Id: I1986f550ac0dc934bfa5db84b40a6419d6608c7e
    Closes-Bug: 1807630