TSKV-logs, config and signals.

* Add signal handlers: for SIGTERM (stop), SIGINT (stop) and SIGUSR1
(restart)
* Add argparser (--config)
* Add json config for server
* GopherServer delegate async-loop control to Manager
* Improve TSKVLogger, add TSKVLoggerAdapter (analog logging.LoggerAdapter). Fix log system
* Fix indexing