* Beginning to refactor server tests
* Extended test framework to include running wallet servers and miners. Also some changes to the wallet reciever api to include a wallet config and set the data directly for the wallet file explicitly rather than assuming it's always in the working dir.
* Adding wallet config to main executable
* Adding ability to select wallet server while mining
* Configurable wallet receiver url
Operations on the wallet data file are now fenced by a lock to
avoid potentially messy concurrent modifications by multiple
processes (i.e. the wallet receiver and a send command). The lock
is done using a create-only lock file, which is an atomic
operation.
Fixes a few loose ends in the full cycle of sending coins,
accepting them, pushing that transaction to the pool and having it
mined. More specifically:
* The API output endpoint needs to be a UTXO endpoint, as the
server can't make any guarantee about having a spent output.
* Bubbling up HTTP not found errors.
* Wallet output status checker now handles spent outputs.
* Transaction pool validates the transaction before accepting it.
* Fixed the operation API routes.
* Fixed too greedy wallet coin selection loop.
* Transactions coming from the network are now pushed to the pool
through the net adapter.
* New blocks accepted by the chain are sent to the pool for
eviction.
* The miner requests transactions from the pool to build its
blocks.
* The push API adds to the pool, removing the mock.
* Implementation of the adapter to the chain required by the pool
to get consistent UTXOs. Grossly unoptimized until we have the UTXO
MMR ready.
