Remove bind formulas include

Due to the fact that Bind9 salt-formula is directly included in Designate,
designate formulas will always try to setup bind9 on the same node.
After this commit in order to deploy Designate with Bind9 backend,
we need to run:
salt -C 'I@bind:server' state.sls bind
salt -C 'I@designate:server' state.sls designate
Also bind9utils package has been added, in order to rndc tool is
available for Designate.

Change-Id: Icbe2b98239de09321a8b59c7df5a112bbd643be1
diff --git a/designate/server.sls b/designate/server.sls
index 82be0ad..fd9e7a0 100644
--- a/designate/server.sls
+++ b/designate/server.sls
@@ -5,8 +5,10 @@
 
 {%- if server.backend.bind9 is defined %}
 
-include:
-- bind
+designate_bind_packages:
+  pkg.installed:
+    - names:
+      - bind9utils
 
 {%- if server.backend.bind9.rndc_key is defined %}