[Dual-ToR] add default value for ACL rule for mellanox platform (#13547)

- Why I did it
Need to add the possibility to choose between dropping packets (using ACL) on ingress or egress in Dual ToR scenario

- How I did it
Add new attribute "mux_tunnel_ingress_acl" to SYSTEM_DEFAULTS table

- How to verify it
check that new attribute exists in redis:
admin@sonic:~$ redis-cli -n 4
127.0.0.1:6379[4]> HGETALL SYSTEM_DEFAULTS|mux_tunnel_ingress_acl
1."state"
2."false"

Signed-off-by: Andriy Yurkiv <ayurkiv@nvidia.com>

files/build_templates/init_cfg.json.j2

@@ -133,5 +133,16 @@
             "digits_class": "true",
             "special_class": "true"
         }
+    },
+    "SYSTEM_DEFAULTS" : {
+{%- if include_mux == "y" %}
+        "mux_tunnel_egress_acl": {
+{%- if sonic_asic_platform == "mellanox" %}
+            "status": "enabled"
+{% else %}
+            "status": "disabled"
+{% endif %}
+        }
+{% endif %}
     }
 }

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -2227,6 +2227,10 @@
         "SYSTEM_DEFAULTS": {
             "tunnel_qos_remap": {
                 "status": "enabled"
+            },
+            "mux_tunnel_egress_acl":
+            {
+                "status": "enabled"
             }
          },
         "LOSSLESS_TRAFFIC_PATTERN": {

src/sonic-yang-models/tests/yang_model_tests/tests_config/system_defaults.json

@@ -6,6 +6,10 @@
                     {
                         "name": "tunnel_qos_remap",
                         "status": "enabled"
+                    },
+                    {
+                        "name": "mux_tunnel_egress_acl",
+                        "status": "enabled"
                     }
                 ]
             }
@@ -18,6 +22,10 @@
                     {
                         "name": "tunnel_qos_remap",
                         "status": "invalid_status"
+                    },
+                    {
+                        "name": "mux_tunnel_egress_acl",
+                        "status": "invalid_status"
                     }
                 ]
             }