fix bug in userAgent (#1111)

- fix the userAgent bug

Author: pfrcks

source/plugins/ruby/CAdvisorMetricsAPIClient.rb

@@ -951,14 +951,14 @@ def getResponse(winNode, relativeUri)
                             :verify_mode => OpenSSL::SSL::VERIFY_NONE) do |http|
               cAdvisorApiRequest = Net::HTTP::Get.new(uri.request_uri)
               cAdvisorApiRequest["Authorization"] = "Bearer #{bearerToken}"
-              cAdvisorApiRequest["User-Agent"] = getUserAgent()
+              cAdvisorApiRequest["User-Agent"] = KubernetesApiClient.getUserAgent()
               response = http.request(cAdvisorApiRequest)
               @Log.info "Got response code #{response.code} from #{uri.request_uri}"
             end
           else
             Net::HTTP.start(uri.host, uri.port, :use_ssl => false, :open_timeout => 20, :read_timeout => 40) do |http|
               cAdvisorApiRequest = Net::HTTP::Get.new(uri.request_uri)
-              cAdvisorApiRequest["User-Agent"] = getUserAgent()
+              cAdvisorApiRequest["User-Agent"] = KubernetesApiClient.getUserAgent()
               response = http.request(cAdvisorApiRequest)
               @Log.info "Got response code #{response.code} from #{uri.request_uri}"
             end