[admin] public-webapps-testsuite is now Closed

[Arthur Barstow]

As discussed a few weeks ago, public-webapps-testsuite is now closed and 
all previous subscribers have been unsubscribed.

For all testing related discussions specific to WebApps, please use the 
public-webapps list and  infrastructure type discussions, please use the 
public-test-infra list.

-Thanks, AB