To avoid fd leak with fetch request for SSL server

Author: hsbt

test/net/http/test_https.rb

@@ -321,6 +321,7 @@ def test_identity_verify_failure
     @log_tester = lambda {|_| }
     ex = assert_raise(OpenSSL::SSL::SSLError){
       http.request_get("/") {|res| }
+      sleep 0.5
     }
     re_msg = /certificate verify failed|hostname \"#{HOST_IP}\" does not match/
     assert_match(re_msg, ex.message)

test/net/http/utils.rb

@@ -252,6 +252,7 @@ def setup
   end
 
   def teardown
+    sleep 0.5 if @config['ssl_enable']
     if @server
       @server.shutdown
     end