Add more errors to ignore list in UDP socket

UDPServer overwrites Cool.io's IO#on_readable so
it should handle unrecoverable IO error like TCPSocket.

https://github.com/tarcieri/cool.io/blob/c79b4dff788071fcc45fac838d5d76dc645b8c1d/lib/cool.io/io.rb#L128

Signed-off-by: Masahiro Nakagawa <[email protected]>

lib/fluent/plugin_helper/server.rb

@@ -523,7 +523,7 @@ def initialize(sock, max_bytes, flags, close_socket, log, under_plugin_developme
           def on_readable_without_sock
             begin
               data = @sock.recv(@max_bytes, @flags)
-            rescue Errno::EAGAIN, Errno::EWOULDBLOCK, Errno::EINTR, Errno::ECONNRESET
+            rescue Errno::EAGAIN, Errno::EWOULDBLOCK, Errno::EINTR, Errno::ECONNRESET, IOError, Errno::EBADF
               return
             end
             @callback.call(data)
@@ -536,7 +536,7 @@ def on_readable_without_sock
           def on_readable_with_sock
             begin
               data, addr = @sock.recvfrom(@max_bytes)
-            rescue Errno::EAGAIN, Errno::EWOULDBLOCK, Errno::EINTR, Errno::ECONNRESET
+            rescue Errno::EAGAIN, Errno::EWOULDBLOCK, Errno::EINTR, Errno::ECONNRESET, IOError, Errno::EBADF
               return
             end
             @callback.call(data, UDPCallbackSocket.new(@sock, addr, close_socket: @close_socket))