FAB-14415 Multi-node kafka2raft e2e test

- Add a 3-node migration test - 3 kafka orderers to a 3-node
  Raft cluster.
- Supply a valid Raft metadata on all transactions.

Change-Id: Ie1035a280b9b6e6f02b305a76185a4098fae2519
Signed-off-by: Yoav Tock <tock@il.ibm.com>

Author: tock-ibm