staging: lustre: update version to 2.5.99

With all but one of the the missing patches from the
lustre 2.6 version merged upstream its time to update
the upstream clients version.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>