[neighbor_advertise]: Use the existing MIRROR ACL table (sonic-net#605)

Currently only one IPv4 mirror type ACL table is supported.
Thus, in order to insert an ACL rule, we use the existing table
in the configuration.

Add the priority to the ACL rule as well.

Signed-off-by: Shu0T1an ChenG <shuche@microsoft.com>

scripts/neighbor_advertiser

@@ -33,7 +33,7 @@ SYSLOG_IDENTIFIER = 'neighbor_advertiser'
 #
 
 MIRROR_SESSION_NAME = 'neighbor_advertiser'
-MIRROR_ACL_NAME = 'neighbor_advertiser_acl'
+MIRROR_ACL_TABLE_NAME = 'EVERFLOW'
 MIRROR_ACL_RULE_NAME = 'rule_arp'
 VXLAN_TUNNEL_NAME = 'neighbor_advertiser'
 VXLAN_TUNNEL_MAP_PREFIX = 'map_'
@@ -306,32 +306,19 @@ def add_mirror_session(dst_ipv4_addr):
     config_db.set_entry('MIRROR_SESSION', MIRROR_SESSION_NAME, session_info)
 
 
-def add_mirror_acl():
-    all_vlan_ports = []
-    for vlan_intf in get_vlan_interfaces():
-        all_vlan_ports.extend(get_vlan_interface_members(vlan_intf))
-
-    acl_info = {
-        'policy_desc': 'neighbor advertiser',
-        'type': 'mirror',
-        'ports': all_vlan_ports
-    }
-
-    config_db.set_entry('ACL_TABLE', MIRROR_ACL_NAME, acl_info)
-
 
 def add_mirror_acl_rule():
     acl_rule_info = {
+        'PRIORITY': '8888',
         'ether_type': '2054',
         'mirror_action': MIRROR_SESSION_NAME
     }
 
-    config_db.set_entry('ACL_RULE', (MIRROR_ACL_NAME, MIRROR_ACL_RULE_NAME), acl_rule_info)
+    config_db.set_entry('ACL_RULE', (MIRROR_ACL_TABLE_NAME, MIRROR_ACL_RULE_NAME), acl_rule_info)
 
 
 def set_mirror_tunnel(ferret_server_ip):
     add_mirror_session(ferret_server_ip)
-    add_mirror_acl()
     add_mirror_acl_rule()
     log_info('Finish setting mirror tunnel; Ferret: {}'.format(ferret_server_ip))
 
@@ -344,17 +331,12 @@ def remove_mirror_session():
     config_db.set_entry('MIRROR_SESSION', MIRROR_SESSION_NAME, None)
 
 
-def remove_mirror_acl():
-    config_db.set_entry('ACL_TABLE', MIRROR_ACL_NAME, None)
-
-
 def remove_mirror_acl_rule():
-    config_db.set_entry('ACL_RULE', (MIRROR_ACL_NAME, MIRROR_ACL_RULE_NAME), None)
+    config_db.set_entry('ACL_RULE', (MIRROR_ACL_TABLE_NAME, MIRROR_ACL_RULE_NAME), None)
 
 
 def reset_mirror_tunnel():
     remove_mirror_acl_rule()
-    remove_mirror_acl()
     remove_mirror_session()
     log_info('Finish resetting mirror tunnel')