in_tail: Fix a regression of retrying unaccessible files

When a fluentd proccess doesn't have permision to read a file, it should
retry to open it again. But the current implementation doesn't do it due
to a bug introduced at #3378. This pull request intend to rescue EACCESS
on stat(2) but it also rescue it on open(2) wrongly.

Signed-off-by: Takuro Ashie <ashie@clear-code.com>

lib/fluent/plugin/in_tail.rb

@@ -1063,7 +1063,7 @@ def open
         rescue RangeError
           io.close if io
           raise WatcherSetupError, "seek error with #{@path}: file position = #{@watcher.pe.read_pos.to_s(16)}, reading bytesize = #{@fifo.bytesize.to_s(16)}"
-        rescue Errno::ENOENT, Errno::EACCES
+        rescue Errno::ENOENT
           nil
         end