ipareplica: Support inventory groups.ipaserver

Altough most of ansible-freeipa documentation and playbooks use
'ipaserver' as the group for the first server deployed for a realm, the
ipareplica role only supported the use of groups["ipaservers"] as an
alternative to set ipareplica_servers.

Also supporting groups.ipaserver, as already supported by the ipaclient
role, make ansible-freeipa playbooks more consistent and current
documentation and examples easier to follow when deploying a cluster
with a server and a replica.

roles/ipareplica/tasks/install.yml

@@ -57,6 +57,11 @@
     ipareplica_servers: "{{ groups['ipaservers'] | list }}"
   when: groups.ipaservers is defined and ipareplica_servers is not defined
 
+- name: Install - Set ipareplica_servers from cluster inventory
+  ansible.builtin.set_fact:
+    ipareplica_servers: "{{ groups['ipaserver'] | list }}"
+  when: ipareplica_servers is not defined and groups.ipaserver is defined
+
 - name: Install - Set default principal if no keytab is given
   ansible.builtin.set_fact:
     ipaadmin_principal: admin