Panic with docker and no Redis connection

[matdehaast]

Seems there is a panic without any logging if you attempt to run the latest ilp-node from dockerhub.

Steps to reproduce

1. docker pull interledgerrs/ilp-node
2. docker run -it interledgerrs/ilp-node --ilp_address example.node_a \ --secret_seed 8852500887504328225458511465394229327394647958135038836332350604 \ --admin_auth_token admin-a \ --redis_url redis://127.0.0.1:6379/ \ --http_bind_address 127.0.0.1:7770 \ --settlement_api_bind_address 127.0.0.1:7771

This will result in the following

thread 'main' panicked at 'calledResult::unwrap()on anErrvalue: ()', src/libcore/result.rs:1188:5 note: run withRUST_BACKTRACE=1environment variable to display a backtrace.

Ideally it should give an error about there being no redis connection etc and then panic.