Snapshot release for benchmark

Snapshot release for benchmarking.

How to run

As example, you have 3 servers: node-a, node-b, node-c.

1. Prepare environment variables on each server like:

export NETTY_DISCOVERY_HOST="node-a"
export NETTY_DISCOVERY="node-a,node-b,node-c"

2. At first server run benchmark-bootstrap.sh to initialize raft server as first leader
3. At others servers run benchmark.sh to connect to existing cluster
4. Open browser with page http://node-a:8800/admin/index.html
5. Open tab Raft state and check that cluster contains all nodes
6. Open tab Start benchmark and run it
7. Wait some time for benchmark response
   ...
   ???
   PROFIT!!!