* 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
* Use vote signer service in fullnode
* Use native types for signature and pubkey, and address other review comments
* Start local vote signer if a remote service address is not provided
* Rebased to master
* Fixes after rebase
* Break out last_ids into its own module
* Boot SignatureNotFound from BankError
* No longer return BankError from LastIds methods
* No longer piggypack on BankError for a LastIds signature status
* Drop all dependencies on the bank
* SignatureStatus -> Status and LastIds -> StatusDeque
* Unstable tests, issue 2193
* Cluster Replicated Data Store
Separate the data storage and merge strategy from the network IO boundary.
Implement an eager push overlay for transporting recent messages.
Simulation shows fast convergence with 20k nodes.
* Added tests to thin client to test VoteContract calls, fix VoteContract sizing errors
* Calculate upper bound on VoteProgram size at runtime, add test for serializing/deserializing a max sized VoteProgram state
* Add Vote Contract
* Move ownership of LeaderScheduler from Fullnode to the bank
* Modified ReplicateStage to consume leader information from bank
* Restart RPC Services in Leader To Validator Transition
* Make VoteContract Context Free
* Remove voting from ClusterInfo and Tpu
* Remove dependency on ActiveValidators in LeaderScheduler
* Switch VoteContract to have two steps 1) Register 2) Vote. Change thin client to create + register a voting account on fullnode startup
* Remove check in leader_to_validator transition for unique references to bank, b/c jsonrpc service and rpcpubsub hold references through jsonhttpserver
* Add PoH height to process_ledger()
* Moved broadcast_stage Leader Scheduling logic to use Poh height instead of entry_height
* Moved LeaderScheduler logic to PoH in ReplicateStage
* Fix Leader scheduling tests to use PoH instead of entry height
* Change is_leader detection in repair() to use PoH instead of entry height
* Add tests to LeaderScheduler for new functionality
* fix Entry::new and genesis block PoH counts
* Moved LeaderScheduler to PoH ticks
* Cleanup to resolve PR comments
