Query for global catalog servers at the forest level

Ticket: #6980
Fix the form title for certificates

Ticket: #7054
Use proper attribute mapping for home directory in AD

Ticket: #7035
Don't allow the DNS to be configurable.

- I was wrong about BIND being able to be used on a different machine.
  So, only use what is available. Perhaps in the future this can be more
  configurable, but for now, take it how we give it to you.

Ticket: #7074