[8u communication] JDK 8 Updates porting process

[Seán Coffey]

With JDK 9 now entering the RDP2 phase, the bar for getting fixes into 
that release is high. A current requirement for JDK 8u fixes is ensuring 
that the changes are integrated into later JDK release families first 
[Rule 1, [1]]. If jdk8u ports are being blocked because of this, please 
let the JDK 8 Update Project maintainers know.

While we wait for the JDK 9 Updates Project to form, I'd like to propose 
that we allow ports from JDK 10 into JDK 8 Updates where needed. We can 
open a '9-pool' record to track the JDK 9 port. I'll make the proposed 
change to the JDK 8 Updates rules next Friday if no objections are heard.

[1] http://openjdk.java.net/projects/jdk8u/groundrules.html