Ledger state syncing / pull missing transactions - minor cleanup and improvements. #125
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Stop pulling missing transactions in case state sync needs to be done immediately instead of waiting for now more missing transaction
Lower most of syncing related timeouts - pulling, querying etc
Add check for live connections in most places - before pulling and for
SelectPeers
Change how gossip network part works - do not store streams, create new stream each time instead and just pass in case of error - it avoid problem using "dead" connection and connection which were not removed from map. And since we send transactions in batch overhead of creating new connection is not that big.