[ruby/net-http] Reset keep_alive timer on new connection

The last_communicated timestamp is for HTTP persistent connection, to
decide whether the current TCP connection may be reused for the
subsequent requests or not. Naturally, the timer must be reset if the
connection is recreated since it is no longer relevant.

https://github.com/ruby/net-http/commit/0a013de42d

lib/net/http.rb

@@ -1055,6 +1055,7 @@ module Net   #:nodoc:
                                write_timeout: @write_timeout,
                                continue_timeout: @continue_timeout,
                                debug_output: @debug_output)
+      @last_communicated = nil
       on_connect
     rescue => exception
       if s

test/net/http/test_http.rb

@@ -1168,6 +1168,30 @@ class TestNetHTTPKeepAlive < Test::Unit::TestCase
     }
   end
 
+  def test_keep_alive_reset_on_new_connection
+    # Using WEBrick's debug log output on accepting connection:
+    #
+    #   "[2021-04-29 20:36:46] DEBUG accept: 127.0.0.1:50674\n"
+    @log_tester = nil
+    @server.logger.level = WEBrick::BasicLog::DEBUG
+
+    start {|http|
+      res = http.get('/')
+      http.keep_alive_timeout = 1
+      assert_kind_of Net::HTTPResponse, res
+      assert_kind_of String, res.body
+      http.finish
+      assert_equal 1, @log.grep(/accept/i).size
+
+      sleep 1.5
+      http.start
+      res = http.get('/')
+      assert_kind_of Net::HTTPResponse, res
+      assert_kind_of String, res.body
+      assert_equal 2, @log.grep(/accept/i).size
+    }
+  end
+
   class MockSocket
     attr_reader :count
     def initialize(success_after: nil)