ioapic: Rely fully on the InterruptSourceGroup to manage interrupts

This commit relies on the interrupt manager and the resulting interrupt
source group to abstract the knowledge about KVM and how interrupts are
updated and delivered.

This allows the entire "devices" crate to be freed from kvm_ioctls and
kvm_bindings dependencies.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

devices/src/lib.rs

@@ -10,8 +10,6 @@
 extern crate bitflags;
 extern crate byteorder;
 extern crate epoll;
-extern crate kvm_bindings;
-extern crate kvm_ioctls;
 extern crate libc;
 #[macro_use]
 extern crate log;