Add support for forward/reverse DNS range split

- Allow for explicit reverse RFC1918 lookups with unbound_reverse_zones
- Add tests, similar to NSD ones
- Wait for network to be online before starting (fixes AETHER-1041)
- Multiplatform support

Change-Id: I385aec6f766b45a9db595d2f8af5ed8fe0dde2ca
diff --git a/defaults/main.yml b/defaults/main.yml
index bf988ec..725181c 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -20,5 +20,9 @@
 # Forwarders
 unbound_forward_zones: []
 
-# DNS zones
-dns_zones: {}
+# Reverse zones, used to allow queries against RFC1918 domains
+unbound_reverse_zones: []
+
+# DNS forward/reverse zones, see also NSD role
+dns_forward_zones: {}
+dns_reverse_zones: {}