Added more options for LDAP configurations and fixed package upgrade process

Hi, 

I was using a wrapper cookbook in order to have the correct LDAP configurations for my environment. I added these changes to the main cookbook.

Also, I had an issue with the new cookbook, it tried to install a new version of rundeck and it fails. The dpkg command can't continue because it needs the confirmation to overwrite the /etc/default/rundeck file.

Regards.
Can you break these out into a configurable/overridable attribute. We may not want to force every user to pass these options in