modified configure

Signed-off-by: jason-foo <fujianshuang@gmail.com>
fixed bug: UDP: removed binding ip to sock when application sends data out

I misunderstood about the relationship of binding and sending data: In fact
sending data to a specific destination never means the application wants to bind
that address to it's socket.

Signed-off-by: jason-foo <fujianshuang@gmail.com>
Replaced fifo with Unix domain socket.

I used fifo for communication mechanism between the daemon server and the user
application library, but fifo has a lot of limitations. Now we don't need to
worry about them any more.

Signed-off-by: jason-foo <fujianshuang@gmail.com>