select: Add simple epoll test.

select/test_epoll.py

@@ -0,0 +1,10 @@
+import select
+import os
+
+
+ep = select.epoll()
+ep.register(0, select.EPOLLIN)
+res = ep.poll(2000)
+print(res)
+for ev, fd in res:
+    print(os.read(fd, 256))