Allow to specify alternate server name for postfixadmin

[RomanKisilenko]

https://github.com/zuazo/postfix-dovecot-cookbook/blob/master/recipes/postfixadmin.rb#L22 explicitly sets the node['postfixadmin']['server_name'].

On some configurations I do want to be able to override it looks like it is not possible at the moment.

[zuazo]

If you are having problems with that, you can always overwrite it using node.override:

node.override['postfixadmin']['server_name'] = 'postfixadmin.example.com'

https://docs.chef.io/attributes.html#attribute-types

[RomanKisilenko]

Nope, it does not work for me. What I'm trying to achieve is to set it to nil. node.override['postfixadmin']['server_name'] = nil does not work for me. But when I remove the line mentioned above it starts working just fine.

[zuazo]

Why do you want to set it to nil instead of other value? What error gives you?

[RomanKisilenko]

I'm getting 403 Forbidden for postfixadmin URL due to hostname mismatch. I can work around it, though.