Exclude some characters from password generator (Closes #3429)

Marius Burkard

2016-02-10 af01e42f2b0b17bacba3e78aeea12b7c235688f5

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user = {mysql_server_ispconfig_user}
password = {mysql_server_ispconfig_password}
dbname = {mysql_server_database}
query = SELECT 'greylisting' FROM (SELECT greylisting, source AS email FROM mail_forwarding WHERE server_id = {server_id} UNION SELECT greylisting, email FROM mail_user WHERE server_id = {server_id}) addresses WHERE addresses.email='%s' AND addresses.greylisting='y'
hosts = {mysql_server_ip}