Bug#42589 mysql_fix_privilege_tables.sh to be deprecated

- Remove remnants of "mysql_fix_privilege_tables.sh"(again)

mysql-test/include/default_my.cnf

@@ -12,14 +12,6 @@ log-bin=                 master-bin
 [mysqlbinlog]
 disable-force-if-open
 
-# mysql_fix_privilege_tables.sh does not read from [client] so it
-# need its own section
-[mysql_fix_privilege_tables]
-socket=                  @client.socket
-port=                    @client.port
-user=                    @client.user
-password=                @client.password
-
 [ENV]
 MASTER_MYPORT=           @mysqld.1.port
 MASTER_MYSOCK=           @mysqld.1.socket