Olaoluwa Osuntokun ed954785b2 rpc: add unary+streaming interceptors to log all errors ...

Not all errors that occur when serving client requests in the gRPC
server are logged. As a result, at times, we can be lacking critic
information that can be used to debug issues that pop up. With this PR,
we create a basic streaming+unary interceptor that will log all errors
that occur when servicing calls.

The current format looks something like this in the logs when an error
occurs:

```
[ERR] RPCS: [/lnrpc.Lightning/SendCoins]: decoded address is of unknown format
```

2019-08-06 19:41:41 -07:00

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