Fix cookie check in node remap test

Change-Id: I41e234e2b887c11d78b1849cf35962714c7484cb
Reviewed-on: https://review.couchbase.org/c/ns_server/+/217975
Reviewed-by: Ben Huddleston <[email protected]>
Well-Formed: Build Bot <[email protected]>
Tested-by: Timofey Barmin <[email protected]>

Author: timofey-barmin

cluster_tests/testsets/node_remap_tests.py

@@ -213,7 +213,7 @@ def start_and_test_remapped_cluster(self, old_cluster, old_uuid,
             new_uuid = c.get_cluster_uuid()
             assert old_uuid != new_uuid
 
-            new_cookie = c.get_cluster_uuid
+            new_cookie = c.get_cookie()
             assert old_cookie != new_cookie
 
             # MB-62201: alternate addresses should be removed