Squashed commit of the following:

commit 5383b541ac08e62782769bf82ee19fb128139fb2
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Tue Jun 30 01:52:41 2020 +0200

    change timeout

commit 3b8be6cd51a3b6ee4aadce144fe47037bd3bcd35
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Tue Jun 30 00:12:54 2020 +0200

    allow arbitrary group id

* commit 'bee88c9b':
  fix test
  producer retrieves stream info
  start providing last id via producer
  fix using non-positive ids
  refactor, add integration tests
  refactor, implement last_ack_id
  return nacks
  update hasicorp pack to latest versions
  implement ack function
  started working at acks
  refactor
  create position pointer if not exist on each get_next request

* commit '40741c0a':
  update changelog
  refactor broker, added substream to callback, updated docs
  remove checking stream exists

* commit 'aaf41dd8':
  add quick start c++ examples
  change layout for c++ docs

* commit '45064063':
  add numeric prefix to python versino name
  rename tags
  use latest tag for all except master

* commit '81b43062':
  [Receiver] Fixed coverage tests
  [Receiver] Fixed missing cpp files in RDS test
  [Receiver] Fixed Online <-> Offline name mixup
  [Producer] renamed receiver_address to discovery_service_endpoint
  [Receiver] Fixed use after free bug
  [Receiver] Added the possibility the easily add new type of NetServers
  [RDS] Added some folders

* commit 'fd554840': (26 commits)
  remove AdvertiseIP
  update nomad files
  fix windows test
  fix curl client
  update discovery config
  add start/stop services script to windows tests
  kill nginx on windows properly
  remove multibroker windows test
  fix tests
  change AdvertiseIP->AdvertiseURI, update helm chart to set dataservice AdvertiseURI
  fix tests
  fix discovery service endpoint
  update service names
  update coverage
  update coverage
  add mod files
  update discovery for kubernetes, requires go 1.11+
  refactor discovery
  add mongodb
  add grafana
  ...

* commit '8b12bd71':
  [RDS] Fixed windows build
  [fabric::rds] Removed wrong const. WTF there was even mutable in the code.
  [fabric::rds::tcp] Removed GetNewRequests initialize behavior
  [RDS] Removed source_id exposure to the client
  [RDS] Added request argument to SendResponse
  [RDS] Moved request to fist be the first argument
  [RDS] Splitted ProcessRequestUnlocked
  [RDS] Applied code style
  Disabled daemon mode for nginx automatic tests
  [RDS] Refactored NetServer to SendResponse/SendResponseAndSlotData