basic-system/network: Use ansible_hostname instead of inventory_hostname

The latter one is not always a non-qualified name, in AStA it is a FQDN.

basic-system/tasks/network.yml

@@ -21,7 +21,7 @@
 
 - name: ensure the hostname is not a fqdn
   hostname:
-    name: "{{ inventory_hostname }}"
+    name: "{{ ansible_hostname }}"
   when: not dns_hostname_fqdn
   notify:
     - gather network facts once again

basic-system/templates/hosts.j2

@@ -7,11 +7,11 @@ ff02::2 ip6-allrouters
 ff02::3 ip6-allhosts
 
 {% for host in hosts_alternates %}
-{{ host }}	{{ ansible_host }} {{ inventory_hostname }}
+{{ host }}	{{ ansible_host }} {{ ansible_hostname }}
 {% else %}
-{{ ansible_default_ipv4.address }}	{{ ansible_host }} {{ inventory_hostname }}
+{{ ansible_default_ipv4.address }}	{{ ansible_host }} {{ ansible_hostname }}
 {% if 'address' in ansible_default_ipv6 %}
-{{ ansible_default_ipv6.address }}	{{ ansible_host }} {{ inventory_hostname }}
+{{ ansible_default_ipv6.address }}	{{ ansible_host }} {{ ansible_hostname }}
 {% endif %}
 {% endfor %}