Completely separated socket info per gateway worker.

Added handling when new socket info cant be obtained.
Switch to number of connections per worker instead of total number.
Added reference to socket info struct inside socket data.
Changed the code according to new socket info reference field inside SD.
Merge branch 'develop' of https://github.com/Starcounter/Starcounter into develop
Removed pad from socket info since socket infos are not shared.