Fix in ispconfig url detection function when nginx returns '_' as $_SERVER[...

tbrehm

2013-04-17 e6a2917b9de293e735df5dbf0b10dce967185f45

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user = {mysql_server_ispconfig_user}
password = {mysql_server_ispconfig_password}
dbname = {mysql_server_database}
table = mail_user
select_field = CONCAT(SUBSTRING_INDEX(email,'@',-1),'/',SUBSTRING_INDEX(email,'@',1),'/')
where_field = login
additional_conditions = and postfix = 'y' and server_id = {server_id}
hosts = {mysql_server_ip}