Comment 2 for bug 1709777

Reviewed: https://review.openstack.org/492385
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=7f79a55edc3e2dea51e65047af1708eb4d0745e3
Submitter: Jenkins
Branch: master

commit 7f79a55edc3e2dea51e65047af1708eb4d0745e3
Author: Saravanan KR <email address hidden>
Date: Thu Aug 10 11:40:48 2017 +0530

    Add hypen to the prefix/suffix of container name if not provided

    If suffix is provided without hypen at the start, prefix hypen
    to the suffix, to support creation of image names like
    openstack-nova-compute-docker, where docker is the suffix.
    Also if prefix is provided without hypen at the end, add hypen
    at the end of the prefix.
    Closes-Bug: #1709777

    Change-Id: I2330a6f35a12bf140da8b52114cb20844efc5554