ipatests: Make sure we re-kinit as admin before adding the disabledipauser

When we add the disabledipauser during the setup class part of the
BaseTestLegacyClient, we need to make sure that we re-kinit admin
since we do ntpsync with the AD just before that, which can render
the previous ticket invalid.

Reviewed-By: Nathaniel McCallum <npmccallum@redhat.com>

ipatests/test_integration/test_legacy_clients.py

@@ -221,6 +221,8 @@ class BaseTestLegacyClient(object):
     def install(cls):
         super(BaseTestLegacyClient, cls).install()
 
+        tasks.kinit_admin(cls.master)
+
         password_confirmation = (
             cls.master.config.admin_password +
             '\n' +