Linux: Add support for Lustre FID2PATH ioctl (#331829)

This is a modified version of a patch provided by Frank Zago (fzago@cray.com).


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14233 a5019735-40e9-0310-863c-91ae7b9d1cf9
NEWS: Add #331829 (Unexpected ioctl opcode sign extension)

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14234 a5019735-40e9-0310-863c-91ae7b9d1cf9