The overcloud delete command will now use the ansible playbook found
within the tripleo-ansible project to process the stack delete workflow.
story: 2007212
task: 2007212
Depends-On: Ic0bd173ad34d1c01a58a66d9a754acd3093a972c
Change-Id: I9f461803ecf3abdf46c0b2b629e6e6708f3160cb