[FAB-2195] Fix infinite loop in mspconf

https://jira.hyperledger.org/browse/FAB-2195

Refactoring the MSP config handler code it made sense to embed the MSP
manager into the config handler structure.  This results in an infinite
loop which this CR addresses.

Change-Id: I78e7d9e5079e954f4ed891a659bb0c3c94d620d7
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>

common/configtx/handlers/msp/config.go

@@ -73,8 +73,3 @@ func (bh *MSPConfigHandler) ProposeConfig(configItem *common.ConfigItem) error {
 	bh.proposedMgr = msp.NewMSPManager()
 	return bh.proposedMgr.Setup(bh.config)
 }
-
-// DesierializeIdentity allows *MSPConfigHandler to implement the msp.Common interface
-func (bh *MSPConfigHandler) DeserializeIdentity(serializedIdentity []byte) (msp.Identity, error) {
-	return bh.DeserializeIdentity(serializedIdentity)
-}