in_monitor_agent: use HttpServer::Request#query due to remove CGI.parse

Signed-off-by: Shizuo Fujita <fujita@clear-code.com>

Author: Watson1978

lib/fluent/plugin/in_monitor_agent.rb

@@ -15,7 +15,6 @@
 #
 
 require 'json'
-require 'cgi'
 
 require 'fluent/config/types'
 require 'fluent/plugin/input'
@@ -151,7 +150,7 @@ def build_option(req)
         qs = Hash.new { |_, _| [] }
         # parse ?=query string
         if req.query_string
-          qs.merge!(CGI.parse(req.query_string))
+          qs.merge!(req.query)
         end
 
         # if ?debug=1 is set, set :with_debug_info for get_monitor_info

test/plugin/test_in_monitor_agent.rb

@@ -5,6 +5,7 @@
 require 'fluent/config'
 require 'fluent/event_router'
 require 'fluent/supervisor'
+require 'fluent/version'
 require 'net/http'
 require 'json'
 require_relative '../test_plugin_classes'