need to set the default value for LowercaseMetricNames

to fix a name undefined error in kairosdb_writer, or else the writer
would not write outputs to kairosdb due to initialization failure.

Change-Id: Id5756f7caf644616b6da3e3396984bcb52d64a80

chef/cookbooks/collectd/files/default/kairosdb_writer.py

@@ -21,6 +21,7 @@ from traceback import format_exc
 
 host = None
 port = None
+lowercase_metric_names = False
 prefix = None
 types = {}
 postfix = None

chef/cookbooks/collectd/recipes/kairosdb.rb

@@ -34,6 +34,7 @@ collectd_python_plugin "kairosdb_writer" do
               "KairosDBProtocol"=>node['collectd']['server']['protocol'],
               "Tags" => "host=#{node['fqdn']}\" \"role=OSROLE\" \"location=China.Beijing.TsingHua\" \"cluster=#{node['cluster']}",
               "TypesDB" => node['collectd']['types_db'],
+              "LowercaseMetricNames"=>"true"
              }
   options(opts)
 end