Update node and apply some fixes

- Node
	- Load Coordinator Fee Account from config
		- Sign the AccountCreationMsg to generate the
		  AccountCreationAuth
		- Resolve #465
	- Wait for synchronizer termination before stopping coordinator to avoid
	  getting stuck when closing in the following case:
		- The coordinator stops reading the synchronizer msg channel,
		  and the node gets stuck sending a message to that channel.
- Common
	- Move account creation auth signature code to common.
	- Update RollupConstInputSHAConstantBytes
- Coordinator
	- Set batch status in the debug file
	- Propagate SCVariables on reorg
	- Pipeline: Get SCVariables updates
		- Resolve #457
	- Fix off by 1 error in Pipeline.shouldL1L2Batch() (which shouldn't have
	  caused any problem, but it was not right)
- KVDB
	- Delete future checkpoints after reset
	- In `ResetFromSynchronizer`, remove all checkpoints first, and follow
	  the same logic as `reset()`.
- Cli
	- Add command to generate a BabyJubJub key pair (to be used for the
	  Coordinator Fee Account)
- Node
	- Adjust example config `Coordinator.L1BatchTimeoutPerc` to avoid
	  missing the L1Batch deadline with the following setup:
		- a block is mined every 2 seconds
		- single proof server that takes 2 seconds to calculate a proof
- TxProcessor
	- Close temporary pebble used for the exit tree after usage.
		- Resolve #463

coordinator/batch.go

@@ -14,14 +14,22 @@ import (
 	"github.com/hermeznetwork/tracerr"
 )
 
-// TxStatus is used to mark the status of an ethereum transaction
-type TxStatus string
+// Status is used to mark the status of the batch
+type Status string
 
 const (
-	// TxStatusPending marks the Tx as Pending
-	TxStatusPending TxStatus = "pending"
-	// TxStatusSent marks the Tx as Sent
-	TxStatusSent TxStatus = "sent"
+	// StatusPending marks the Tx as Pending
+	StatusPending Status = "pending"
+	// StatusForged marks the batch as forged internally
+	StatusForged Status = "forged"
+	// StatusProof marks the batch as proof calculated
+	StatusProof Status = "proof"
+	// StatusSent marks the EthTx as Sent
+	StatusSent Status = "sent"
+	// StatusMined marks the EthTx as Mined
+	StatusMined Status = "mined"
+	// StatusFailed marks the EthTx as Failed
+	StatusFailed Status = "failed"
 )
 
 // BatchInfo contans the Batch information
@@ -40,9 +48,9 @@ type BatchInfo struct {
 	CoordIdxs             []common.Idx
 	ForgeBatchArgs        *eth.RollupForgeBatchArgs
 	// FeesInfo
-	TxStatus TxStatus
-	EthTx    *types.Transaction
-	Receipt  *types.Receipt
+	Status  Status
+	EthTx   *types.Transaction
+	Receipt *types.Receipt
 }
 
 // DebugStore is a debug function to store the BatchInfo as a json text file in