Add a test for the list command
Add a test for the list command

A recent change pointed out we don't have coverage for this command
outside of the integration test. Fix this by adding a unittest to cover
the list command.

Co-Authored-By: Gregory Haynes <79e2475f81a6317276bf7cbb3958b20d289b78df@greghaynes.net>
Change-Id: I5ca3c92cd82d4cc057d64946a1bae44b52def7e8

Tesora/tesora-nodepool,citrix-openstack/nodepool,citrix-openstack/nodepool,seandst/nodepool,Tesora/tesora-nodepool,seandst/nodepool