ipaserver: Fix issue with setup_dns and forwarders or no_forwarders

When forwarders list or the no_forwarders flag has been set, the
configuraiton does not reflect the setting. With no_forwarders
the preparation step of the DNS server could fail in ipaserver_prepare.

This is addressing the issue of pull request #25.

roles/ipaserver/tasks/install.yml

@@ -134,6 +134,8 @@
       reverse_zones: "{{ result_ipaserver_test.reverse_zones }}"
       no_reverse: "{{ ipaserver_no_reverse }}"
       auto_reverse: "{{ ipaserver_auto_reverse }}"
+      forwarders: "{{ ipaserver_forwarders | default([]) }}"
+      no_forwarders: "{{ ipaserver_no_forwarders }}"
       auto_forwarders: "{{ ipaserver_auto_forwarders }}"
       no_dnssec_validation: "{{ result_ipaserver_test.no_dnssec_validation }}"
       ### additional ###