Use GSS_C_NT_HOSTBASED_SERVICE, not GSS_KRB5_NT_PRINCIPAL_NAME

Using `GSS_KRB5_NT_PRINCIPAL_NAME`, and setting the realm to anything other than the empty realm, is a recipe for failure in multi-realm environments.

For example, today I had to debug a case involving three realms, let's call them `AD.FOO.EXAMPLE`, `FOO.EXAMPLE`, and `N.FOO.EXAMPLE`, where on a Linux system `[libdefaults] default_realm = N.FOO.EXAMPLE`, and the SQL Server's principal really is `MSSQLSvc/someserver.ad.foo.example@AD.FOO.EXAMPLE`, but `mssql-cli` constructed a raw Kerberos principal name of the form `MSSQLSvc/someserver.ad.foo.example@`, i.e., `MSSQLSvc/someserver.ad.foo.example@N.FOO.EXAMPLE`. The client credentials we for `user@AD.FOO.EXAMPLE`...

What happened then was that the client fetched a cross-realm TGT, `krbtgt/N.FOO.EXAMPLE@FOO.EXAMPLE` then asked a KDC for `N.FOO.EXAMPLE` for a service ticket for `MSSQLSvc/someserver.ad.foo.example@N.FOO.EXAMPLE`, which yielded a referral to `FOO.EXAMPLE`, which then rejected the request because it would mean doubling back to `AD.FOO.EXAMPLE`, which would be a loop.

Constructing an alternate `krb5.conf` with `[libdefaults] default_realm = AD.FOO.EXAMPLE` and using it by setting the `KRB5_CONFIG` environment variable worked around the problem by causing `mssql-cli` to construct the correct service principal name, `MSSQLSvc/someserver.ad.foo.example@AD.FOO.EXAMPLE`.

If `mssql-cli` had either use `GSS_C_NT_HOSTBASED_SERVICE` and `MSSQLSvc@someserver.ad.foo.example`, or `GSS_KRB5_NT_PRINCIPAL_NAME` and `MSSQLSvc/someserver.ad.foo.example@` (note the "empty" realm), then it would have worked without us having to work around it.

Bắt đầu bằng cách xác định nơi mssql-cli xây dựng service principal Kerberos cho các kết nối SQL Server. So sánh dạng GSS_C_NT_HOSTBASED_SERVICE được báo cáo với dạng GSS_KRB5_NT_PRINCIPAL_NAME bằng cách sử dụng một realm trống, sau đó xác minh hành vi trong một thiết lập đa realm như được mô tả. Hoàn tất có nghĩa là client không còn phụ thuộc vào realm mặc định đã cấu hình cho service principal này.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.