This commit is trying to DRY up the initiation of the gRPC client in
each command:
It renames the function to CLI instead of GRPC as it actually set up a
CLI client, not a generic grpc client
It also moves the configuration of address, timeout (which is now
consistent) and api to use Viper, allowing users to set it via env vars
and configuration file
This commit adds a debug command tree, intended to host commands used
for debugging and testing.
It adds a create node/machine command which will be used later to create
machines that can be used to test the registration command.
