Remove unused template file

This is follow-up of c3cd975d50 and
removes the template file for pools.yaml, which is now generated by
puppet-designate.

Change-Id: I5357859ac6f45740f2505e4a5ebe35c780798eaa

templates/pools.yaml.erb

@@ -1,29 +0,0 @@
----
-- name: default
-  description: Puppet BIND Pool
-  attributes: {}
-
-  ns_records:
-    - hostname: ns1.example.org.
-      priority: 1
-
-  nameservers:
-    - host: 127.0.0.1
-      port: 5322
-
-  targets:
-    - type: bind9
-      description: BIND Instance
-
-      masters:
-        # mdns doesn't support ipv6
-        - host: 127.0.0.1
-          port: 5354
-
-      options:
-        host: 127.0.0.1
-        port: 5322
-        rndc_host: 127.0.0.1
-        rndc_port: 953
-        rndc_config_file: /etc/rndc.conf
-        rndc_key_file: /etc/rndc.key