Installer: activate nss and pam services in sssd.conf

If there is already a sssd.conf file before the installer is
executed, the nss and pam services may not be enabled by the
installer. This happens for instance if the machine is hardened
for STIG and sssd.conf does not define services=... in the
[sssd] section.

The consequence is that trust cannot be established with an AD
domain.

The installer must enable nss and pam services even if there is
a pre-existing sssd.conf file.

Fixes: https://pagure.io/freeipa/issue/9427

Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

ipaclient/install/client.py

@@ -969,6 +969,9 @@ def configure_sssd_conf(
         nss_service.set_option('memcache_timeout', 600)
         sssdconfig.save_service(nss_service)
 
+    sssd_enable_service(sssdconfig, 'nss')
+    sssd_enable_service(sssdconfig, 'pam')
+
     domain.set_option('ipa_domain', cli_domain)
     domain.set_option('ipa_hostname', client_hostname)
     if cli_domain.lower() != cli_realm.lower():