Option to configure ecosystem for testnet

[jessopb]

lbrycrd --testnet | --regtest

lbrynet:

• daemon-settings.yml: blockchain_name: lbrycrd_testnet

chainquery: blockchain name is currently hardcoded according to Jack.

[Leopere]

There are a number of big changes for --testnet and --regtest which should be discussed with @tiger5226 and possibly @jessopb as I've merged in the Refactor branch @tiger5226's independent container files into the main Dockerfile for lbrycrd such that there's simply an environment variable and a few lines of code in the start.sh for the RUN_MODE=testnet and RUN_MODE=regtest.

[Leopere]

This feature and branch cannot be merged without @tiger5226 and #61

[Leopere]

https://github.com/lbryio/chainquery/blob/master/e2e/e2e.sh needs updated to use the new compose files.