Add /dev/frandom support

Signed-off-by: flar2 <asegaert@gmail.com>
AIO: Don't plug the I/O queue in do_io_submit()

Signed-off-by: flar2 <asegaert@gmail.com>
Add SIO and FIOPS i/o schedulers

Signed-off-by: flar2 <asegaert@gmail.com>
Makefile: enable pipe

Signed-off-by: flar2 <asegaert@gmail.com>