Modify proxy only if none given yet.

roles/apt-cacher/tasks/main.yml

@@ -19,7 +19,7 @@
 - name: enable apt-cacher-ng for install-clients
   replace:
     dest: "{{ tftp_root }}/d-i/{{ di_dist }}/preseed.cfg"
-    regexp: '^(d-i mirror/http/proxy string.*)$'
+    regexp: '^d-i mirror/http/proxy string$'
     replace: 'd-i mirror/http/proxy string http://{{ ansible_hostname }}:3142/'
   when: preseedcfg.stat.exists
 

roles/krb5-kdc-ldap/tasks/main.yml

@@ -176,7 +176,7 @@
     - HTTP
   when: not krb5kdc.stat.exists
 
-- name: add principal to the keytab
+- name: add principal to the default keytab
   command: kadmin.local -q 'ktadd {{ item }}/{{ ansible_hostname }}.{{ ansible_domain }}'
   with_items:
     - host