* Add trait for RpcRequestHandler trait for RpcClient and add MockRpcClient for unit tests
* Add request_airdrop integration test
* Add timestamp_tx, witness_tx, and cancel_tx to wallet integration tests; add wallet integration tests to test-stable
* Add test cases
* Ignore plentiful sleeps in unit tests
* Remove logging init from storage program: saw a crash in a test
indicating the logger being init'ed twice.
* Add entry_height mining proof to indicate which segment the result is
for
* Add an interface to get storage miner pubkeys for a given entry_height
* Add an interface to get the current storage mining entry_height
* Set the tvu socket to 0.0.0.0:0 in replicator to stop getting entries
after the desired ledger segment is downloaded.
* Use signature of PoH height to determine which block to download for
replicator.
* Move more of the replicator logic into the replicator class
* Add support for the RPC interface to query the storage last_id value
that the replicator would sign and use to pick a block.
* Fix replicator connecting to gossip and change test to exercise that
scenario.
* Vote signing JSON RPC service
- barebone service that listens for RPC requests
* Daemon for vote signer service
* Add request APIs for JSON RPC
* Cleanup of cargo dependencies
* Fix compiler error