Remove trailing whitespaces in tests

Author: kajinamit

spec/classes/dns_init_spec.rb

@@ -269,10 +269,10 @@
           'listen-on-v6 { none; };',
         ])}
       end
- 
+
       describe 'with rpz zone' do
         let(:params) { {:rpz_zones => [ 'rpz.block.local' ]} }
-        
+
         it { verify_concat_fragment_contents(catalogue, 'options.conf+10-main.dns', [
           'zone "rpz.block.local";'
         ])}