PR: #610
Description:
- completely redesigned training
- new concept of training auth
- separate methods for finding out the price.
- new payment implementation
- new implementation of signature verification
- some config parameters have been renamed to improve readability and simplicity:
- ipfs_end_point -> ipfs_endpoint
- passthrough_endpoint -> service_endpoint
- daemon_end_point -> daemon_endpoint
- metering_end_point -> metering_endpoint
- heartbeat_svc_end_point -> heartbeat_endpoint
- notification_svc_end_point -> notification_endpoint