[release] Prepare for next development iteration

Change-Id: I909d4d4076122aa7d9a4f56cd551b136213c694c
Avoid String concatenation in log messages

Change-Id: I4ff09bc813dddbcaf544e739e45eddd08c646049
[release] Prepare release 4.2.0

Change-Id: I4670965ab17077fc784ee7742ff880388af37a7f