Fix some ansible-lint complaints.

kerberox.yml

@@ -5,7 +5,7 @@
 - name: apply configuration to the kerberox server
   hosts: all
   remote_user: ansible
-  become: yes
+  become: true
 
   vars:
     ## This interface provides the default route:
@@ -34,7 +34,7 @@
         In case you would like to prepare a test user 'foo' and have
         not done so yet, provide foo's password here.  Leave empty to
         just continue
-      private: yes
+      private: true
 
 
   pre_tasks:
@@ -50,7 +50,9 @@
     - netboot-installer
     - dnsmasq
     - apt-cacher
-    - { role: krb5-kdc-ldap, when: not run_in_installer|default(false)|bool }
-    - { role: nfs-server, when: not run_in_installer|default(false)|bool }
+    - role: krb5-kdc-ldap
+      when: not run_in_installer|default(false)|bool
+    - role: nfs-server
+      when: not run_in_installer|default(false)|bool
     - prepare4clients
     - kerberize