[FAB-4420] Suppress benign channel create warning

During channel creation, the orderer creates a template channel to apply
the channel creation request to.  This allows for the same signature
checking and validation path to be re-used that is used for config
updates.

However, the template config which the update is applied to is not a
truly valid 'fabric application config', because it does not define
/Channel/Application/Readers or /Channel/Application/Writers, although
it does define an application section.

This causes warnings to superfluously be printed suggesting that the
current config is likely incorrect.

This CR makes an admittedly hacky, but minimally invasive change to
suppress these log messages.

Change-Id: I06dc42a4185b1bf585869a8003436dc622e4606b
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>

common/policies/policy.go

@@ -132,6 +132,10 @@ type ManagerImpl struct {
 	config        *policyConfig
 	pendingConfig map[interface{}]*policyConfig
 	pendingLock   sync.RWMutex
+
+	// SuppressSanityLogMessages when set to true will prevent the sanity checking log
+	// messages.  Useful for novel cases like channel templates
+	SuppressSanityLogMessages bool
 }
 
 // NewManagerImpl creates a new ManagerImpl with the given CryptoHelper
@@ -290,7 +294,7 @@ func (pm *ManagerImpl) CommitProposals(tx interface{}) {
 	pm.config = pendingConfig
 	delete(pm.pendingConfig, tx)
 
-	if pm.parent == nil && pm.basePath == ChannelPrefix {
+	if pm.parent == nil && pm.basePath == ChannelPrefix && !pm.SuppressSanityLogMessages {
 		for _, policyName := range []string{ChannelReaders, ChannelWriters} {
 			_, ok := pm.GetPolicy(policyName)
 			if !ok {

orderer/multichain/manager.go

@@ -22,6 +22,7 @@ import (
 	"github.com/hyperledger/fabric/common/config"
 	"github.com/hyperledger/fabric/common/configtx"
 	configtxapi "github.com/hyperledger/fabric/common/configtx/api"
+	"github.com/hyperledger/fabric/common/policies"
 	"github.com/hyperledger/fabric/orderer/ledger"
 	cb "github.com/hyperledger/fabric/protos/common"
 	"github.com/hyperledger/fabric/protos/utils"
@@ -300,5 +301,17 @@ func (ml *multiLedger) NewChannelConfig(envConfigUpdate *cb.Envelope) (configtxa
 		},
 	}, msgVersion, epoch)
 
-	return configtx.NewManagerImpl(templateConfig, configtx.NewInitializer(), nil)
+	initializer := configtx.NewInitializer()
+
+	// This is a very hacky way to disable the sanity check logging in the policy manager
+	// for the template configuration, but it is the least invasive near a release
+	pm, ok := initializer.PolicyManager().(*policies.ManagerImpl)
+	if ok {
+		pm.SuppressSanityLogMessages = true
+		defer func() {
+			pm.SuppressSanityLogMessages = false
+		}()
+	}
+
+	return configtx.NewManagerImpl(templateConfig, initializer, nil)
 }