Remove Puppet 5 testing

We have pivoted to Ansible and We don't use puppet5 anywhere.  Stop
testing on Bionic as we're not really interested in maintaing it, and
remove the puppet-install installation path there so we don't have
code that isn't being tested.

Change-Id: Ia2d05f7c75e46bc01717d11457b832e42522fa95

roles-test/puppet-install.yaml

@@ -10,8 +10,5 @@
     - role: puppet-install
       puppet_install_version: 4
 
-- name: Install puppet5
-  hosts: puppet5
-  roles:
-    - role: puppet-install
-      puppet_install_version: 5
+# NOTE(ianw) 2020-06 : we have moved away from puppet which is why we
+# don't test anything later.

roles/puppet-install/tasks/puppet-install/bionic.yaml

@@ -1,26 +0,0 @@
-# Prior versions not supported on Bionic
-- fail:
-    msg: "Unsupported puppet version '{{ puppet_install_version }}' on this platform"
-  when: puppet_install_version not in [5,]
-
-- name: Install puppet 5 packages
-  when: puppet_install_version == 5
-  become: true
-  block:
-    - name: Install puppetlabs repo
-      apt:
-        deb: https://apt.puppetlabs.com/puppet5-release-bionic.deb
-
-    - name: Install puppet packages
-      apt:
-        name:
-          - puppet-agent
-          - ruby
-        update_cache: yes
-
-- name: Stop and disable puppet service
-  service:
-    name: puppet
-    state: stopped
-    enabled: no
-  become: yes

zuul.d/system-config-roles.yaml

@@ -38,9 +38,6 @@
         - name: base
           label: ubuntu-bionic
       groups:
-        - name: puppet5
-          nodes:
-            - base
         - name: openafs
           nodes:
             - base