docs: def get_hypervisor():
      '''
      Returns the name of the hypervisor running on this node or ``None``.
  
      Detected hypervisors:
  
      - kvm
      - xen
      - bhyve
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' virt.get_hypervisor
  
      .. versionadded:: 2019.2.0
          the function and the ``kvm``, ``xen`` and ``bhyve`` hypervisors support
      '''
      # To add a new 'foo' hypervisor, add the _is_foo_hyper function,
      # add 'foo' to the list below and add it to the docstring with a .. versionadded::
      hypervisors = ['kvm', 'xen', 'bhyve']
      result = [hyper for hyper in hypervisors if getattr(sys.modules[__name__], '_is_{}_hyper'.format(hyper))()]
      return result[0] if result else None