Test roles api: Close db session after test POST
Test roles api: Close db session after test POST

Eposes a bug where the role isn't comitted to the database

gazeti/aleph,alephdata/aleph,alephdata/aleph,gazeti/aleph,pudo/aleph,pudo/aleph,alephdata/aleph,OpenGazettes/aleph,alephdata/aleph,gazeti/aleph,pudo/aleph,OpenGazettes/aleph,gazeti/aleph,OpenGazettes/aleph,OpenGazettes/aleph,alephdata/aleph