Merge pull request #86 from cloud-gov/filter

just making it a string

jobs/ingestor_cloudwatch/templates/config/input_and_output.conf.erb

@@ -4,7 +4,7 @@ input
   {
     log_group_prefix => true
     <% if_p("logstash_ingestor.cloudwatch.prefix") do |prefix_list| %>
-    log_group => <%= prefix_list %>
+    log_group => "<%= prefix_list %>"
     <% end %>
     <% if_p("logstash_ingestor.cloudwatch.region") do |region_zone| %>
     region => "<%= region_zone %>"