[IPA] Start the clean step unattended

This needs user input if not run with --unattended. Let's add this parameter to
fix that.

Signed-off-by: Michal Konecny <mkonecny@redhat.com>

roles/ipa/server/tasks/main.yml

@@ -177,7 +177,9 @@
     # This will clean the previous installation and allows
     # the replica to be deployed.
   - name: clean client installation
-    command: ipa-server-install --uninstall
+    command: ipa-server-install
+             --uninstall
+             --unattended
     when: ansible_distribution_major_version|int >= 9
 
   - name: deploy replica