Ignore channel double creation during replication.
Ignore channel double creation during replication.

fix #2931

Signed-off-by: Jay Guo <91d7eeb83d08be0dc56ea674009c4b53383e15b3@gmail.com>

hyperledger/fabric,manish-sethi/fabric,hyperledger/fabric,manish-sethi/fabric,jimthematrix/fabric,jimthematrix/fabric