---
- hosts: '{{ host }}'
  # Skip gather facts - host may not exist yet
  gather_facts: false
  tasks:
    - name: 'lxc guest configuration'
      import_role: name='lxc_guest'
      vars:
        vm_name: '{{ inventory_hostname }}'
      delegate_to: '{{ ansible_lxc_host }}'

    - name: 'CONNETION | use ssh_lxc'
      set_fact: ansible_connection='ssh_lxc'

    - name: 'gather facts - now the host must exist'
      setup:
      tags:
        - 'always'

    - block:
        - name: 'ssh server offline configuration'
          import_role: name='ssh_server'

        - name: 'CONNECTION | use ssh [now host is online]'
          set_fact: ansible_connection='ssh'

      when: configure_ssh|d(true)
...