Merge slave and master playbooks into one for DNS.

dns/dns-configupdate.yml

@@ -1,6 +1,6 @@
 ---
 - user: root
-  hosts: dns-slaves
+  hosts: dnsservers
   gather_facts: no
   tasks:
   - name: update dns-infrastructure git repo

dns/dns-master.yml

@@ -1,12 +0,0 @@
----
-- user: root
-  hosts: dns-master
-  gather_facts: no
-  tasks:
-  - name: update dns-infrastructure git repo
-    git: repo=git@bitbucket.org:staticsafe/dns-infrastructure.git dest=/src/dns-infrastructure version=debian-master update=yes accept_hostkey=yes
-    notify:
-    - reload nameserver daemon
-  handlers:
-    - name: reload nameserver daemon
-      action: service name=bind9 state=reloaded