OSRA-313 Re-enable RSpec config

https://osraav.atlassian.net/browse/OSRA-313

 - uncomment config settings in spec/spec_helper.rb
 - fix failures in orphan_spec that resulted from enabling
   `mocks.verify_partial_doubles = true` (L77)

OSRA-313 #Code-Review
I am just in the process of doing that. After using verifying doubles, I got into the habit of declaring a double's methods before trying to stub them (otherwise you get a `does not implement` error), but with a simple double that is not necessary.