ipaserver: Fix deployment after Bronze-bit fix

As FreeIPA now requires MS-PAC to be set in ipaKrbAuthzData to trigger
PAC generation, there's a timing issue that causes API malfunction which
is long enough to cause the client part insallation to fail.

By restarting KDC after DS password is set, we force cached values to be
refreshed, allowing the API to work correctly.

Resolves: freeipa#1200

roles/ipaserver/library/ipaserver_set_ds_password.py

@@ -131,7 +131,8 @@
 from ansible.module_utils.ansible_ipa_server import (
     check_imports,
     MAX_DOMAIN_LEVEL, AnsibleModuleLog, options, sysrestore, paths,
-    api_Backend_ldap2, ds_init_info, redirect_stdout, setup_logging
+    api_Backend_ldap2, ds_init_info, redirect_stdout, setup_logging,
+    krbinstance, service
 )
 
 
@@ -221,6 +222,17 @@ def main():
     with redirect_stdout(ansible_log):
         ds.change_admin_password(options.admin_password)
 
+    # Force KDC to refresh the cached value of ipaKrbAuthzData by restarting.
+    # ipaKrbAuthzData has to be set with "MS-PAC" to trigger PAC generation,
+    # which is required to handle S4U2Proxy with the Bronze-Bit fix.
+    # Not doing so would cause API malfunction for around a minute, which is
+    # long enough to cause the hereafter client installation to fail.
+    fstore = sysrestore.FileStore(paths.SYSRESTORE)
+    krb = krbinstance.KrbInstance(fstore)
+    krb.set_output(ansible_log)
+    service.print_msg("Restarting the KDC")
+    krb.restart()
+
     # done ##########################################################
 
     ansible_module.exit_json(changed=True)