ipaclient vars: Renamed ipaclient_package to ipaclient_packages

The rename was needed to be able to have more than one package in the list
of required packages.

For RHEL-7.3 it has been needed to add ipa-admintools to have /usr/bin/ipa
available. libselinux-python has been added for all.

roles/ipaclient/tasks/install.yml

@@ -3,8 +3,9 @@
 
 - name: Install - Install IPA client package
   package:
-    name: "{{ ipaclient_package }}"
+    name: "{{ item }}"
     state: present
+  with_items: "{{ ipaclient_packages }}"
 
 - name: Install - IPA discovery
   ipadiscovery: