Currently Remote publishing doesn't recognise user links when publishing since userkeys are all unique in each space. Improve this behaviour by finding a way to see if the same user exists in the other space.

Steps to reproduce:

1. Set up a remote publishing instance, be sure that same users exist in both space.

2. Create a version and a versioned page in the source space

3. Add a user link to the page and publish this to target space.

Expected result:
Users should be identified in the target space as well since they exist on both space.

Actual result:
"Not an unresolved user" is replacing the user link in the published space