Reintroduce user cache
This was required by avatars and was broken with https://github.com/owncloud/core/pull/16200 Fixes https://github.com/owncloud/core/issues/16942
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This was required by avatars and was broken with https://github.com/owncloud/core/pull/16200 Fixes https://github.com/owncloud/core/issues/16942