Introduce short, random reconnection delay

[Steve-Mcl]

Description

To mitigate concerns like #74 due to connection storms on the broker, we have had some discussion around introducing a short random delay to the broker reconnection logic.

As an initial number, we discussed up to 30s as a maximum delay.

What is unclear at this time is if this would improve matters during large disconnect/reconnect cycles or have an affect of extend any issues resulting from it.

We discussed internally potential load testing on a non production platform - that would go some way to fine tuning this connection delay.

As a side note, there are other strategies and ongoing works that will further mitigate potential connection storm like issues - however these are not quickly achievable tasks.

related: #74
related: #98

Epic/Story

No response

Tasks

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1. Device Agent reconnect delay device-agent#314
   +0
   
2. Project Nodes reconnect delay #103
   +0
   

[Steve-Mcl]

both merged