Use run_once for checking ansible version instead of localhost (#10908)

The `assert` module does not connect to the host anyway, and this avoids
skipping the assert when running with --limit.

playbooks/ansible_version.yml

 ---
 - name: Check Ansible version
-  hosts: localhost
+  hosts: all
   gather_facts: false
   become: no
+  run_once: true
   vars:
     minimal_ansible_version: 2.15.5  # 2.15 versions before 2.15.5 are known to be buggy for kubespray
     maximal_ansible_version: 2.17.0
-    ansible_connection: local
   tags: always
   tasks:
     - name: "Check {{ minimal_ansible_version }} <= Ansible version < {{ maximal_ansible_version }}"