roles: strict truthy values

According to Ansible we can use yes, true, True, "or any quoted st-
ring" for a boolean true, but ansible-lint wants us to use either
true or false.

See: https://chronicler.tech/red-hat-ansible-yes-no-and/

misc-plays/change_password.yml

@@ -13,13 +13,13 @@
 
 - hosts: all
   user: provisioning
-  become: yes
+  become: true
   vars_files:
     - "../vars/{{ ansible_distribution }}.yml"
 
   tasks:
     - name: Set password, shell, homedir for provisioning user
       when: provisioning_user is defined
-      user: name={{ provisioning_user.name }} password={{ provisioning_user.password }} shell={{ provisioning_user.shell }} state={{ provisioning_user.state }} createhome=no
+      user: name={{ provisioning_user.name }} password={{ provisioning_user.password }} shell={{ provisioning_user.shell }} state={{ provisioning_user.state }} createhome=false
 
 # vim: set sw=2 ts=2: