Ensure JSON RPC support is enough to run ethstats against Nethermind

[tkstanczak]

https://github.com/ethereum/wiki/wiki/Network-Status
cubedro/eth-netstats#328

0|node-app | 2018-09-26 13:41 +00:00: [eth]
0|node-app | 2018-09-26 13:41 +00:00: [eth] NET STATS CLIENT
0|node-app | [eth] v0.1.1
0|node-app | [eth]
0|node-app | [eth]
0|node-app | 2018-09-26 13:41 +00:00: [eth] =i= Starting web3 connection
0|node-app | 2018-09-26 13:43 +00:00:
0|node-app | 2018-09-26 13:43 +00:00: [sys] xxx Closed node watcher
0|node-app | 2018-09-26 13:43 +00:00: [sys] xxx Closed out remaining connections.
0|node-app | 2018-09-26 13:45 +00:00: [eth]
0|node-app | 2018-09-26 13:45 +00:00: [eth] NET STATS CLIENT
0|node-app | [eth] v0.1.1
0|node-app | [eth]
0|node-app | [eth]
0|node-app | 2018-09-26 13:45 +00:00: [eth] =i= Starting web3 connection

0|node-app | 2018-09-26 13:46 +00:00: [eth] =✘= Web3 connection attempt #0 failed
0|node-app | 2018-09-26 13:46 +00:00: [eth] =✘= Trying again in 500 ms
0|node-app | 2018-09-26 13:46 +00:00: [eth] =✘= Web3 connection attempt #1 failed
0|node-app | 2018-09-26 13:46 +00:00: [eth] =✘= Trying again in 1000 ms

2018-09-26 13:50:27.2586|ERROR|131|JsonWebAPI.Microsoft.AspNetCore.Server.Kestrel|Connection id "0HLH3MPMMSB04", Request id "0HLH3MPMMSB04:00000001": An unhandled exception was thrown by the application. System.InvalidOperationException: Unable to resolve service for type 'Nethermind.JsonRpc.Module.INethmModule' while attempting to activate 'Nethermind.JsonRpc.Module.ModuleProvider'.

[tkstanczak]

done