Steem Load Balancer: Adding Caching of Chosen Node to Improve Performance

I've spent much effort in optimising the algorithm for the Steem Load Balancer: https://github.com/DoctorLai/steem-load-balancer/

Steem Load Balancers

• https://api.steemyy.com (London, UK)
• https://steem.justyy.com (Dallas, TX, USA)

For other nodes: see here

Cache

The recent changes have introduced the caching for the last chosen node. This will improve performance and reduces the number of "poking" requests significantly.

"poking" requests are sent to a list of steem candidate RPC nodes to measure the latency i.e. a fastest node will be chosen to serve the request.

I've also added more tests.

See core changes

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