* stable-2.15:
mvn.py: Explicitly specify version in mvn deploy command
Add missing 'Allow content merges' section title in project config documentation
Allow to disable log file compression
Allow to disable log file rotation
SystemLog: Don't keep Config as a member
AccountIT#deletePreferredEmail: Fix flakiness
Change-Id: Icd25df65e0cfb1ffe624fd1e7e095ecf887e444e