conditionalize all the chef services bringup.

It is not needed on Ubuntu or Debian.
Make 03-create-admin-role idempotent and work with native packaging.
Work around actions that are unneeded on Ubuntu.
Give the node a default overridable realm of Crowbar.
Oops, make sure that couchdb is running.  Thanks, rhafer.
Merge pull request #16 from VictorLowther/pull-req-master-5a61c0feb8bea25dbf1b92b356a5c55f23cd28ba

Merged by devtool for rhafer