[bug] The root account of 127.0.0.1 needs to log in without password.

[runkecheng]

Is your feature request related to a problem? Please describe.

The root account of localhost and 127.0.0.1 needs to log in without password. but the default root password set by yaml is for all root accounts.

Describe the solution you'd like

• Keep the root account 127.0.0.1 and localhost password synchronized.
• Support the use of passwords for backup.
• Set the password of the root account % to a fixed value (only for operator use, no need for users to modify).

Describe alternatives you've considered

Additional context

[runkecheng]

When the password of the root account localhost is inconsistent with the 127.0.0.1 password and when the localhost password is not empty, mysql cannot connect to xenon.

## mysql log
2021/10/15 08:30:52.463249 mysql.go:95: [ERROR] mysql[localhost:3306].ping.error[db.query.timeout[10000, SHOW SLAVE STATUS]].downs:203,downslimits:3
2021/10/15 08:30:52.463318 mysql.go:97: [ERROR] mysql.dead.downs:203,downslimits:3

## xenon log
2021-10-15T08:25:22.441780-00:00 392 [Note] Access denied for user 'root'@'127.0.0.1' (using password: YES）

The host and password in the xenon configuration are set correctly.

bash-5.1$ cat xenon.json 
{
 ...
    "mysql": {
        "admit-defeat-ping-count": 3,
        "admin": "root",
        "ping-timeout": 2000,
        "passwd": "RadonDB@666",
        "host": "localhost",
...
        "port": 3306,
        "monitor-disabled": true
    },
...
}