Refactor and Bug Fixes to Steem Load Balancer

I decided to switch to https://steem.justyy.com which is the Load Balancer Node: https://github.com/DoctorLai/steem-load-balancer

And the node crashes a few hours later, and it turns out there is some problems, thus I've addressed them and also taken this chance to refactor:

Fix undefined server version

this causes node to crash.

Add max_payload_size

See this commit: https://github.com/DoctorLai/steem-load-balancer/commit/f7bde06486485ce91e3dbfc00a3e34e7565f15c6

Restart Always and etc

• Add restart policy
• 300 default max requests per minut
• graceful stop when SIGTERM

• commit 1
• commit 2

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