Reorganize smart contract types, udate eth tests, etc.

- Move smart contract constants and structs for variables to
  common/{ethrollup.go, ethauction.go, ethwdelayer.go}:
    - This removes repeated code of the structs for variables
    - Allows reusing the constants and variables from all modules without
      import cycles
- Remove unused common/scvars.go
- In common.BlockData, split data from each smart contract into a sepparate
  field (Rollup, Auction, WDelayer).  This affects the structures that til uses
  as output, and HistoryDB in the AddBlockSCData.
- In Synchronizer:
    - Pass starting block of each smart contract as config, instead of
      incorrectly using the genesis block found in the acution constant (which
      has a very different meaning)
    - Use variable structs from common instead of an internal copy
    - Synchronize more stuff (resolve some TODOs)
    - Fix some issues found after initial testing with ganache
- In eth:
    - In auction.go: Add method to get constants
    - Update README to use ganache instead of buidlerevm as local blockchain
      for testing
    - Update env variables and test vectors to pass the tests with the
      deployment in the ganache testnet.
    - Use ethereum keys derived from paths (hdwallet) in testing to avoid
      hardcoding private keys and generate the same keys from a mnemonic used
      in the ganache tesnet.

common/ethauction.go

@@ -0,0 +1,44 @@
+package common
+
+import (
+	"math/big"
+
+	ethCommon "github.com/ethereum/go-ethereum/common"
+)
+
+// AuctionConstants are the constants of the Rollup Smart Contract
+type AuctionConstants struct {
+	// Blocks per slot
+	BlocksPerSlot uint8 `json:"blocksPerSlot"`
+	// Minimum bid when no one has bid yet
+	InitialMinimalBidding *big.Int `json:"initialMinimalBidding"`
+	// First block where the first slot begins
+	GenesisBlockNum int64 `json:"genesisBlockNum"`
+	// ERC777 token with which the bids will be made
+	TokenHEZ ethCommon.Address `json:"tokenHEZ"`
+	// HermezRollup smartcontract address
+	HermezRollup ethCommon.Address `json:"hermezRollup"`
+	// Hermez Governanze Token smartcontract address who controls some parameters and collects HEZ fee
+	// Only for test
+	GovernanceAddress ethCommon.Address `json:"governanceAddress"`
+}
+
+// AuctionVariables are the variables of the Auction Smart Contract
+type AuctionVariables struct {
+	// Boot Coordinator Address
+	DonationAddress ethCommon.Address `json:"donationAddress" meddler:"donation_address"`
+	// Boot Coordinator Address
+	BootCoordinator ethCommon.Address `json:"bootCoordinator" meddler:"boot_coordinator"`
+	// The minimum bid value in a series of 6 slots
+	DefaultSlotSetBid [6]*big.Int `json:"defaultSlotSetBid" meddler:"default_slot_set_bid,json"`
+	// Distance (#slots) to the closest slot to which you can bid ( 2 Slots = 2 * 40 Blocks = 20 min )
+	ClosedAuctionSlots uint16 `json:"closedAuctionSlots" meddler:"closed_auction_slots"`
+	// Distance (#slots) to the farthest slot to which you can bid (30 days = 4320 slots )
+	OpenAuctionSlots uint16 `json:"openAuctionSlots" meddler:"open_auction_slots"`
+	// How the HEZ tokens deposited by the slot winner are distributed (Burn: 40% - Donation: 40% - HGT: 20%)
+	AllocationRatio [3]uint16 `json:"allocationRatio" meddler:"allocation_ratio,json"`
+	// Minimum outbid (percentage) over the previous one to consider it valid
+	Outbidding uint16 `json:"outbidding" meddler:"outbidding"`
+	// Number of blocks at the end of a slot in which any coordinator can forge if the winner has not forged one before
+	SlotDeadline uint8 `json:"slotDeadline" meddler:"slot_deadline"`
+}