hub: refactor server and db initialization

* pass the paths to DB and pipe as arguments
* move the connection to sqlite DB into the constructor of the server
* return error instead of panicking when initializing DB fails
* add an Actor for appending data to the sqlite store, start it in the server constructor
* add a somewhat proper Close for the server
* split s5srv.go, extracting pipe-specific code
* make more constants etc. private
* remove unnecessary StatsContainer interface
* use an explicit s5 logger with prefix
* use an in-memory sqlite db for unit tests

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