MS SQL user should not be in sysadmin group to use non-default schema

[knstvk]

Environment

• Documentation version: 7.0
• Part of the documentation: Manual
• Existing page: https://doc.cuba-platform.com/manual-7.1/db_schema_connection.html

Description of the bug or enhancement

MS SQL docs:

The value of DEFAULT_SCHEMA is ignored if the user is a member of the sysadmin fixed server role. All members of the sysadmin fixed server role have a default schema of dbo.

[IskandarovRost]

The custom schema should be defined in the user's "Default schema". In this case, the tables are created there, not DBO.