CLI debug functionality & fixes

[aupiff]

• removed /unsubmitted endpoint
  • it never made sense to expose this via a public api. I just kept around alpha-stage debug functionality for far too long.
• fixed race condition caused by improper use of atomically
  • removed all uses of atomically when it is not strictly necessary (it is only necessary when reading an updating a TVar must be done atomically; this happens in updateConfig during the heartbeat or during finalizeTransaction which updates the execution nonce)
• created scanblockchain & consistencycheck CLI actions to replace /unsubmitted
• modified tests to use scanblockchain function instead of /unsubmitted
• modified loadConfig to accept a filepath parameter
• updated ucacs in test config to reflect the values of ucac addrs on ganache-cli test blockchain
• updated api docs

What a successful consistency check looks like now:

ubuntu@ip-172-30-0-186:~/lndr$ lndr consistencycheck
using default config...
( 368
, 368
, []
, []
) 

NOTE: CLI now expects a lndr-server.config in the home directory. I'd change lndr-backend to require the same instead of using the relative path lndr-backend/data/lndr-server.config but I don't want to mess with @canterberry's deployments.

[canterberry]

Allowing the location of the config file to be provided via CLI argument to the lndr cli tool and the lndr-backend server would be nice. Something like --config-file <path> and/or -f <path>. I'm totally up to update the deployment tooling to drop the config wherever.