Change long timeout to select() from poll()

Change from poll() to select() for the potentially long wait in ipmi
event loop.  This is to facilitate interop with being monkey patched
with eventlet, as eventlet does not currently monkey patch poll(), but
does monkey patch select()

Change-Id: I8d6f42193ee82e2c5de7ad112232c2c77ef78825

pyghmi/ipmi/private/session.py

@@ -165,6 +165,7 @@ class Session:
 
         curmax = cls.socket.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
         cls.poller.register(cls.socket, select.POLLIN)
+        cls.readersockets = [cls.socket]
         cls.ipmipoller.register(cls.socket, select.POLLIN)
         curmax = curmax / 2
         # we throttle such that we never have no more outstanding packets than
@@ -637,7 +638,8 @@ class Session:
         # could be waiting so we can always return 0
         if timeout is None:
             return 0
-        if cls.poller.poll(timeout * 1000):
+        rdylist, _, _ = select.select(cls.readersockets, (), (), timeout)
+        if len(rdylist) > 0:
             while cls.ipmipoller.poll(0):  # if the somewhat lengthy queue
                         # processing takes long enough for packets to come in,
                         # be eager
@@ -698,6 +700,7 @@ class Session:
                          will receive the handle as an argument
         """
         cls._external_handlers[handle.fileno()] = (callback, handle)
+        cls.readersockets += [handle]
         cls.poller.register(handle, select.POLLIN)
 
     @classmethod