Add flexibility for Stack creation

- Use variables for network, flavor and image.
- Make use of the config_drive for the instances.
- Allow for setting DNS servers
- Add note for workaround for Molecule bug for FQCN playbooks

Sem-Ver: feature
Change-Id: Ic3a1c1e8d0ca36926c1db41340405dd2d9bf592d
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index f461374..4dc1dd8 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -32,7 +32,7 @@
     timeout: 3600
     vars:
       tox_environment:
-        STACK_NAME: "atmosphere-{{ zuul.build }}"
+        ATMOSPHERE_STACK_NAME: "atmosphere-{{ zuul.build }}"
     irrelevant-files:
       - doc/.*