Add Ubuntu 20.04 support and use Python 3 (#6157)

roles/bootstrap-os/molecule/default/molecule.yml

@@ -12,8 +12,12 @@ driver:
 platforms:
   - name: ubuntu18
     box: generic/ubuntu1804
-    cpus: 2
-    memory: 2048
+    cpus: 1
+    memory: 512
+  - name: ubuntu20
+    box: generic/ubuntu2004
+    cpus: 1
+    memory: 512
 provisioner:
   name: ansible
   lint:

roles/bootstrap-os/tasks/bootstrap-debian.yml

@@ -2,7 +2,7 @@
 # Some Debian based distros ship without Python installed
 
 - name: Check if bootstrap is needed
-  raw: which python
+  raw: which python3
   register: need_bootstrap
   failed_when: false
   changed_when: false
@@ -77,10 +77,10 @@
     - '"bionic" in os_release.stdout'
     - need_dnssec_allow_downgrade.rc
 
-- name: Install python
+- name: Install python3
   raw:
     apt-get update && \
-    DEBIAN_FRONTEND=noninteractive apt-get install -y python-minimal
+    DEBIAN_FRONTEND=noninteractive apt-get install -y python3-minimal
   become: true
   environment: {}
   when:
@@ -91,4 +91,5 @@
   package:
     name: dbus
     state: present
+    use: apt
   become: true

roles/kubernetes/node/vars/ubuntu-20.yml

@@ -0,0 +1,2 @@
+---
+kube_resolv_conf: "/run/systemd/resolve/resolv.conf"