Fix ceph_public_address for add cmn

Change-Id: If4d3d8d34110b45e2f0f81c2b6a0f2da2f6b3dc3
diff --git a/tcp_tests/tests/system/test_ceph_operations.py b/tcp_tests/tests/system/test_ceph_operations.py
index 96ad61a..b2f98b0 100644
--- a/tcp_tests/tests/system/test_ceph_operations.py
+++ b/tcp_tests/tests/system/test_ceph_operations.py
@@ -511,7 +511,7 @@
         data['MONSETTINGS'] = """
                 ceph_backup_time_hour: ${_param:ceph_mon_node04_ceph_backup_hour}
                 ceph_backup_time_minute: ${_param:ceph_mon_node04_ceph_backup_minute}
-                ceph_public_address: ${_param:ceph_mon_node04_public_address}
+                ceph_public_address: ${_param:ceph_mon_node04_ceph_public_address}
                 keepalived_vip_priority: 104
                 """  # noqa: E501
     # # ------------------RGW specific settings -----------