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
Merge pull request #245 from NikitaAvvakumov/osra-313-reenable-rspec-config

OSRA-313 Re-enable RSpec config
OSRA-313 #Resolve