Fix handling members in ipa role.

When adding new members to a role, the existing members were removed.
The correct behavior for the "member" action is to add those members,
and substitute the existing ones. This patch fixes this behavior.

Fix #409, #411, #412, #413

tests/role/env_facts.yml

@@ -1,7 +1,7 @@
 ---
 - name: Get Domain from server name
   set_fact:
-    ipaserver_domain: "{{ ansible_fqdn | join ('.') }}"
+    ipaserver_domain: "{{ ansible_fqdn.split('.')[1:] | join ('.') }}"
   when: ipaserver_domain is not defined
 
 - name: Set fact for realm name
@@ -12,3 +12,4 @@
 - name: Create FQDN for host01
   set_fact:
     host1_fqdn: "host01.{{ ipaserver_domain }}"
+    host2_fqdn: "host02.{{ ipaserver_domain }}"