[release] Prepare for next development iteration

Change-Id: I89e6c5eae3731a0c56743af43b35393a61277ffb
Complete bidirectional tests

Change-Id: I8ec6cfcafcecde42989629ae12d0de7d0b2dbf02
[release] 4.2.1

Change-Id: Iad054d3a04894026328fa48ddc9255b93448b60c