Revert "AI-709 : renamed UserNoAuthData -> UserToken"

Moving untested code to master branch
This reverts commit 1b32fd703b8d8228bf01c1d423db4a4ff99b36d2.
Revert "AI-709 : user token scopes"

Moving untested code to master branch
This reverts commit 5874c45a0a8fd7c78ebbaef8adf14f4f22284aba.
Revert "AI-709 : keep user secure token in datastore together with scope (for now subscribe/unsubscribe, maybe we will extend it later)"

Moving untested code to master branch
This reverts commit 75419f979ba612f2985dfdcfb2aaed813c09e7b6.