[wsia][security] 8/6 call agenda

Once again I forgot to send this out before taking Monday off. We will pick
up the extracting of security requirements from the scenarios at the
"Supply Chain Aggregation" scenario.

The telecon info for 8/6 at 1PM EST is:
 USA: 888-282-2156
 International: 712-247-0358
 passcode: 801151