This new library provides the common logic used by openstack
clients. Replacing the imports from openstackclient and cliff.
Depends-On-External: https://review.rdoproject.org/r/#/c/2088/
Depends-On: I095209c241876c6ab48595962e07144fc5cc34a6
Closes-Bug: #1620964
Change-Id: I103a13ff6c0af94b82f5e48652380adfbf331d34
(cherry picked from commit 133e8cf91a)