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/coordinator_test.go

@@ -445,7 +445,7 @@ func TestPipelineShouldL1L2Batch(t *testing.T) {
 	modules := newTestModules(t)
 	var stats synchronizer.Stats
 	coord := newTestCoordinator(t, forger, ethClient, ethClientSetup, modules)
-	pipeline, err := coord.newPipeline(ctx, &stats)
+	pipeline, err := coord.newPipeline(ctx)
 	require.NoError(t, err)
 	pipeline.vars = coord.vars
 
@@ -598,7 +598,7 @@ func TestPipeline1(t *testing.T) {
 	batchNum := common.BatchNum(syncStats.Sync.LastBatch)
 	syncSCVars := sync.SCVars()
 
-	pipeline, err := coord.newPipeline(ctx, syncStats)
+	pipeline, err := coord.newPipeline(ctx)
 	require.NoError(t, err)
 
 	// Insert some l2txs in the Pool
@@ -616,7 +616,7 @@ PoolTransfer(0) User2-User3: 300 (126)
 		require.NoError(t, err)
 	}
 
-	err = pipeline.reset(batchNum, syncStats.Sync.LastForgeL1TxsNum, &synchronizer.SCVariables{
+	err = pipeline.reset(batchNum, syncStats.Sync.LastForgeL1TxsNum, syncStats, &synchronizer.SCVariables{
 		Rollup:   *syncSCVars.Rollup,
 		Auction:  *syncSCVars.Auction,
 		WDelayer: *syncSCVars.WDelayer,