Audit Log Plugin audit_log_exclude_accounts setting incompatible when host contains ip address

If we set the value of option audit_log_exclude_accounts to user@ipaddr the audit plugin will ignore and continue to log the account(s) activity.

###### 5.6.35 ######
mysql> select @@version;
+-------------+
| @@version |
+-------------+
| 5.6.35-81.0 |
+-------------+
1 row in set (0.00 sec)

mysql> set global audit_log_exclude_accounts='andrew@::1';
Query OK, 0 rows affected (0.00 sec)

mysql> show global variables like 'audit';
Empty set (0.00 sec)

mysql> show global variables like 'audit%';
+----------------------------+--------------------------+
| Variable_name | Value |
+----------------------------+--------------------------+
| audit_log_buffer_size | 1048576 |
| audit_log_exclude_accounts | andrew@::1 |
| audit_log_exclude_commands | set_option,create_db |
| audit_log_file | /var/log/mysql/audit.log |
| audit_log_flush | OFF |
| audit_log_format | JSON |
| audit_log_handler | FILE |
| audit_log_include_accounts | |
| audit_log_include_commands | |
| audit_log_policy | ALL |
| audit_log_rotate_on_size | 1073741824 |
| audit_log_rotations | 10 |
| audit_log_strategy | PERFORMANCE |
| audit_log_syslog_facility | LOG_USER |
| audit_log_syslog_ident | percona-audit |
| audit_log_syslog_priority | LOG_INFO |
+----------------------------+--------------------------+
16 rows in set (0.00 sec)

mysql> exit
Bye
mysql@c5ff2759530c:/$ mysql -uandrew -ppass --protocol=tcp
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.6.35-81.0 Percona Server (GPL), Release 81.0, Revision c96c427

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mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)

##### /var/log/mysql/audit.log ######
...
{"audit_record":{"name":"Query","record":"6850515_2017-03-30T10:29:04","timestamp":"2017-03-30T11:06:33 UTC","command_class":"select","connection_id":"16","status":0,"sqltext":"select @@version","user":"andrew[andrew] @ [::1]","host":"","os_user":"","ip":"::1","db":""}}

This does not occur in 5.7.16+ Audit Plugin.

Semi-Workaround is possible by omitting the ipaddr if your intentions are for all accounts with the username to be excluded from audit logging.

setting audit_log_exclude_accounts to filter on 'user@' will cover that requirement.