Xfailed a test that fails due to 6250

Also created a decorator that removes the segment that the next test does not
expect.

https://fedorahosted.org/freeipa/ticket/6250

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipatests/test_integration/test_topology.py

@@ -27,6 +27,26 @@ def find_segment(master, replica):
             return '-to-'.join(segment)
 
 
+def remove_segment(master, host1, host2):
+    """
+    This removes a segment between host1 and host2 on master. The function is
+    needed because test_add_remove_segment expects only one segment, but due to
+    track tickete N 6250, the test_topology_updated_on_replica_install_remove
+    leaves 2 topology segments
+    """
+    def wrapper(func):
+        def wrapped(*args, **kwargs):
+            try:
+                func(*args, **kwargs)
+            finally:
+                segment = find_segment(host1, host2)
+                master.run_command(['ipa', 'topologysegment-del',
+                                    DOMAIN_SUFFIX_NAME, segment],
+                                   raiseonerr=False)
+        return wrapped
+    return wrapper
+
+
 @pytest.mark.skipif(config.domain_level == 0, reason=reasoning)
 class TestTopologyOptions(IntegrationTest):
     num_replicas = 2
@@ -64,6 +84,10 @@ class TestTopologyOptions(IntegrationTest):
                               )
         return result
 
+    @pytest.mark.xfail(reason="Trac 6250", strict=True)
+    @remove_segment(config.domains[0].master,
+                    config.domains[0].master,
+                    config.domains[0].replicas[1])
     def test_topology_updated_on_replica_install_remove(self):
         """
         Install and remove a replica and make sure topology information is