Better targeted ISO testing

[Henrik Nilsen Omma]

Martin Pitt wrote:
> For this kind of testing it is important to file detailled bug reports
> about everything you consider important and subscribe (!, not assign)
> "ubuntu-release", so that the release team gets aware of that bug
> immediately and can give feedback, milestone it, etc. 

Which brings up another question: Is that the official preferred way of 
escalating high impact bugs to the release team? In reality we often use 
pings in #ubuntu-devel also. Having several methods is ok, but having 
one official one would be good so we can document it. Worst case is that 
a tester doesn't know of any of the methods and fails to escalate a 
show-stopping bug.

Henrik