Fix some ansible-lint complaints.

edubox.yml

@@ -23,7 +23,7 @@
 - name: apply configuration to the edubox
   hosts: all # eduboxes
   remote_user: ansible
-  become: yes
+  become: true
   vars:
     contname: cont
     ## User name for the user in the container:
@@ -52,19 +52,19 @@
     - name: install apt-cacher-ng
       apt:
         name: apt-cacher-ng
-        state: latest
+        state: latest # noqa package-latest
 
     - name: enable apt-cacher-ng
       lineinfile:
         path: /etc/apt/apt.conf.d/30proxy
         line: 'Acquire::http::Proxy "http://localhost:3142/";'
-        create: yes
+        create: true
 
     - name: enable and start systemd-networkd on the host
       systemd:
         name: systemd-networkd
         state: started
-        enabled: yes
+        enabled: true
 
   roles:
     - up2date-debian