test_config: fix tests for env.fips_mode

Add optional key fips_mode to Env object in tests.

https://fedorahosted.org/freeipa/ticket/5695

Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipatests/test_ipalib/test_config.py

@@ -562,6 +562,7 @@ class test_Env(ClassChecker):
 
         # Test using DEFAULT_CONFIG:
         defaults = dict(constants.DEFAULT_CONFIG)
+        defaults['fips_mode'] = object
         (o, home) = self.finalize_core(None, **defaults)
         assert list(o) == sorted(defaults)
         for (key, value) in defaults.items():