New DEALER-based publisher provided for CALL.
Futures-based reply waiting makes possible to
refuse using of REQ blocking socket and also
reduce number of openned sockets to a socket-per-target
instead of socket-per-message as it was for CALL.
Closes-Bug: #1517999
Optimized redis requests - request once instead of
per each message. This should be elaborated with an
autonomous nodes discovery mechanism to be correct
in general case.
Closes-Bug: #1517993
Reduced number of INFO log messages. Most of them switched
to the DEBUG level.
Closes-Bug: #1517997
Change-Id: Id017e79368cdc68613ddd7adef26411ea422dc8c
eea60cfb36