fix(default.sls): fix subnet declaration

* https://travis-ci.com/saltstack-formulas/bind-formula/jobs/269539556
* Modified commit from #144

Author: fthenard

test/integration/default/controls/config_spec.rb

@@ -169,6 +169,6 @@
     # Match acl1
     its('content') { should match /acl\ client1\ \{\n\ \ 127\.0\.0\.0\/8;\n\ \ 10\.20\.0\.0\/16;\n\};/ }
     # Match acl2
-    its('content') { should match /^acl\ client2\ \{\n\ \ 10\.30\.0\.0\/8;\n\};/ }
+    its('content') { should match /acl\ client2\ \{\n\ \ 10\.0\.0\.0\/8;\n\ \ 10\.30\.0\.0\/16;\n\};/ }
   end
 end

test/salt/pillar/default.sls

@@ -7,7 +7,8 @@ bind:
       - 127.0.0.0/8
       - 10.20.0.0/16
     client2:
-      - 10.30.0.0/8
+      - 10.0.0.0/8
+      - 10.30.0.0/16
   configured_zones:
     example.com:
       type: master