New topology managament modules

There are now two topology management modules placed in the plugins folder:

  plugins/modules/ipatopologysegment.py
  plugins/modules/ipatopologysuffix.py

Topology segments can be added, removed and reinitialized with the
ipatopologysegment module. Also it is possible to verify topology suffixes
with the ipatopologysuffix module.

A new module_utils for plugins has been added:

  plugins/module_utils/ansible_freeipa_module.py

And documentation for the modules:

  README-topology.md

New sample playbooks are available in playbooks/topology:

  playbooks/topology/add-topologysegment.yml
  playbooks/topology/delete-topologysegment.yml
  playbooks/topology/reinitialize-topologysegment.yml
  playbooks/topology/verify-topologysuffix.yml

The plugins folder can be used with the new Ansible Collections supported
by Ansible 2.8 and Ansible galaxy 3.2.