Bind BINLOG ADMIN to @@binlog_format, @@binlog_direct_.., @@sql_log_bin

SET for the following system variables (both GLOBAL and SESSION):

• binlog_format
• binlog_direct_non_transactional_updates
• sql_log_bin

has been allowed only for users with the SUPER privilege.

Let's allow SET for these variables (both GLOBAL and SESSION) also for users with the BINLOG ADMIN privilege.

Note, sql_log_bin is actually a SESSION-only variable (since MariaDB 5.5). However, internally it is still defined as a GLOBAL-and-SESSION variable, while setting the global one is forbidden by non-standard means.