client: register callback for fuse interrupt

client: register callback for fuse interrupt

libfuse allows program to reigster a callback for interrupt. When a file
system operation is interrupted, the fuse kernel driver sends interupt
request to libfuse. libfuse calls the interrupt callback when receiving
interrupt request.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
(cherry picked from commit 289e8b4a7efa1ae6427115af9bbe541c9e1f0e90)