add proposer address to block's Header

Refs #1134

Validation:

- ignored in block.ValidateBasic since it's stateful information
- checked in blockExec.ValidateBlock

state/validation_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	"github.com/tendermint/tendermint/crypto/ed25519"
 	dbm "github.com/tendermint/tendermint/libs/db"
 	"github.com/tendermint/tendermint/libs/log"
 )
@@ -65,4 +66,10 @@ func TestValidateBlock(t *testing.T) {
 	block.ValidatorsHash = []byte("wrong validators hash")
 	err = blockExec.ValidateBlock(state, block)
 	require.Error(t, err)
+
+	// wrong proposer address
+	block = makeBlock(state, 1)
+	block.ProposerAddress = ed25519.GenPrivKey().PubKey().Address()
+	err = blockExec.ValidateBlock(state, block)
+	require.Error(t, err)
 }