[core/input] Handle epoll interrupts

Sometimes epoll poll() calls get interrupted by the system - handle that
more gracefully.

bumblebee/input.py

@@ -28,7 +28,10 @@ def read_input(inp):
         if is_terminated():
             return
 
+        try:
             events = epoll.poll(1)
+        except Exception:
+            continue
         for fileno, event in events:
             line = "["
             while "[" in line: