staging/lustre: Remove memory allocation fault injection framework

Lustre memory allocation wrappers also included a fault injection
framework that's totally redundant, since in-kernel offering is
actually superior to what we had.
So let's remove it.

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>