[FAB-2108] Add channel config schema

https://jira.hyperledger.org/browse/FAB-2108

This CR adds the config schema for the channel configuration (which
references the application and orderer config schemas).

Change-Id: Id75939622e826af0ce4187d59f9b8ba4d16eb7d1
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>

common/configtx/handlers/channel/sharedconfig.go

@@ -20,13 +20,38 @@ import (
 	"fmt"
 	"math"
 
+	"github.com/hyperledger/fabric/common/configtx/handlers/application"
+	"github.com/hyperledger/fabric/common/configtx/handlers/orderer"
 	"github.com/hyperledger/fabric/common/util"
 	cb "github.com/hyperledger/fabric/protos/common"
 
 	"github.com/golang/protobuf/proto"
 	"github.com/op/go-logging"
 )
 
+const (
+	// ApplicationGroupKey is the group name for the application config
+	ApplicationGroupKey = "Application"
+
+	// OrdererGroupKey is the group name for the orderer config
+	OrdererGroupKey = "Orderer"
+)
+
+var Schema = &cb.ConfigGroupSchema{
+	Groups: map[string]*cb.ConfigGroupSchema{
+		ApplicationGroupKey: application.Schema,
+		OrdererGroupKey:     orderer.Schema,
+	},
+	Values: map[string]*cb.ConfigValueSchema{
+		HashingAlgorithmKey:          nil,
+		BlockDataHashingStructureKey: nil,
+		OrdererAddressesKey:          nil,
+	},
+	Policies: map[string]*cb.ConfigPolicySchema{
+	// TODO, set appropriately once hierarchical policies are implemented
+	},
+}
+
 // Chain config keys
 const (
 	// HashingAlgorithmKey is the cb.ConfigItem type key name for the HashingAlgorithm message