Fix #497 - remove outdated properties for director

Using some of the examples will give you a non working director.
Accroding to https://groups.google.com/a/cloudfoundry.org/forum/#!msg/bosh-users/w8AqGFBBqsY/MzUpp2K2cL4J
these properties are outdated and can be removed.

This was already opened once in #498 but got closed due to an open question regarding contributer agreement, which was actually fine. But there is no option to re-open the PR for me.