Add availability zone mapping for VPC subnet

Occasionally the amazon.aws.ec2_vpc_subnet module would randomly choose
an availability zone where not all instance types are availble, causing
the cloud stack workflow to fail.  This PR adds a mapping of common AZs
to the regions available in the survey attached ot the Create VPC job
template, and only creates a subnet from the list of AZs.

common/setup.yml

@@ -285,4 +285,6 @@ controller_notifications:
       http_method: POST
       headers: {}
 
-...
+controller_settings:
+  - name: SESSION_COOKIE_AGE
+    value: 180000