bind: add specs for service check

bind/tests/spec/bind_spec.rb

@@ -4,6 +4,11 @@ require 'uri'
 require 'serverspec'
 set :backend, :exec
 
+describe service('bind9') do
+  it { should be_enabled   }
+  it { should be_running   }
+end
+
 describe port(53) do
   it { should be_listening }
 end