Augment the fabric-samples first-network sample to include an option
to choose etcd/raft as consensus-type.
Extend the -o flag so that it allows users to choose between the
solo, kafka, or etcdraft consensus-type for the ordering service.
Use three orderer nodes.
Change-Id: Ibc4c3564220466aef0a87baee4a2d594e5554a62
Signed-off-by: Yoav Tock <tock@il.ibm.com>
