NM-159: only switch if current gw is inactive (#1138)

* avoid clearing retained messages on host and node updates

* avoid checking port if same as listen port

* Set peer connection interval from server config on startup

* Set peer connection interval from server config on startup

* remove debug log

* Update build_upload_bin.yml

* Update build_upload_bin.yml

* Update build_upload_bin.yml

* Update build_upload_bin.yml

* unset gw if current gw not active

* do checkin every 2 mins

* add logic to check relay node avg latency between peers, sync with server changes

* set timestamp after gateways latency calc

* fix switch between inactive and active relay nodes

* cleanup code

* optimise peer gw latency calc

* optimise finding nearest node

Author: abhishek9686