Associate code harbor links with current user always
Associate code harbor links with current user always

- this applies to creations and updates
- code harbor links are only every edited in the context of the
  authenticated user

(leoselig/codeocean#1)

openHPI/codeocean,openHPI/codeocean,openHPI/codeocean,openHPI/codeocean,openHPI/codeocean,openHPI/codeocean