fix centos 8 testing

molecule/centos8/playbook.yml

@@ -2,6 +2,7 @@
 - name: Converge
   hosts: all
   vars:
+    ansible_python_interpreter: /usr/libexec/platform-python
     lvm_volumes:
       - name: lv_test
         group: vg_test

molecule/centos8/prepare.yml

@@ -4,6 +4,6 @@
   gather_facts: false
   tasks:
     - name: Install python for Ansible
-      raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)
+      raw: test -e /usr/bin/python || (dnf -y install python3 && alternatives --set python /usr/bin/python3)
       become: true
       changed_when: false