apache / shardingsphere / 406

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Fixes #3068 Add a judgment for user's database privileges. (#3079)

* 
1. modify MySQLAuthenticationHandler's login method to return Optional<ProxyUser>.
2. check response41 database with ProxyUser's database.
3. add UT.

* resolve conflicts.

* try CI check again.

* 
1. move schema judgement to MySQLAuthenticationHandler.
2. modify UT.

* 
1. modify the input parameter of MySQLAuthenticationHandler.login().
2. modify UT.

* try CI check again.

* 
1. add ER_DBACCESS_DENIED_ERROR in MySQLServerErrorCode.
2. modify the result of MySQLAuthenticationHandler.login() to Optional<MySQLServerErrorCode>.
3. modify UT classes.

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