Stop assuming a return for select

The code no longer uses tmplist for anything.  It has been observed
that select.select may return something other than a 3 member
tuple, so become apathetic about the nature of the return.

The fact this can happen is in all likelihood a bug in the select
implementation, however it's hard to nail down and easy enough
to tolerate.

Change-Id: Ib13a6dcce0809f9c2c4d9f02e19adc9de818f3fb

pyghmi/ipmi/private/session.py

@@ -107,7 +107,7 @@ def define_worker():
                 if timeout < 0:
                     timeout = 0
                 selectdeadline = _monotonic_time() + timeout
-                tmplist, _, _ = select.select(iosockets, (), (), timeout)
+                select.select(iosockets, (), (), timeout)
                 # pessimistically move out the deadline
                 # doing it this early (before ioqueue is evaluated)
                 # this avoids other threads making a bad assumption