Replaced groups.ipaserver[0] by ansible_fqdn.

Since we are using docker for running the tests we can no longer rely on
groups.ipaserver[0] as the managed host hostname.

tests/host/test_hosts_principal.yml

@@ -6,12 +6,12 @@
   tasks:
   - name: Get Domain from server name
     set_fact:
-      ipaserver_domain: "{{ groups.ipaserver[0].split('.')[1:] | join ('.') }}"
+      ipaserver_domain: "{{ ansible_fqdn.split('.')[1:] | join ('.') }}"
     when: ipaserver_domain is not defined
 
   - name: Get Realm from server name
     set_fact:
-      ipaserver_realm: "{{ groups.ipaserver[0].split('.')[1:] | join ('.') | upper }}"
+      ipaserver_realm: "{{ ansible_fqdn.split('.')[1:] | join ('.') | upper }}"
     when: ipaserver_realm is not defined
 
   - name: Set host1_fqdn .. host2_fqdn