Merge branch 'stable-2.7'

* stable-2.7:
  Update 2.7 release notes with recent changes
  Fix for issue 2016 ssh keys not flushed

Conflicts:
	gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/SetAccountCommand.java

Change-Id: I20de3f6825c31ddb009c1244e62f96b9eb113dd6