Remove irrlevant functionality to CreateDefaultRelationships.
Remove irrlevant functionality to CreateDefaultRelationships.

A stub is retained in case external organisations have written
some auth plugin which does use it.

lkraav/davical-rss-feature-branch,lkraav/davical-rss-feature-branch,lkraav/davical-rss-feature-branch,lkraav/davical-rss-feature-branch