Add new utility function, reap_children(), to test_support. This should

be called at the end of each test that spawns children (perhaps it
should be called from regrtest instead?).  This will hopefully prevent
some of the unexplained failures in the buildbots (hppa and alpha)
during tests that spawn children.  The problems were not reproducible.
There were many zombies that remained at the end of several tests.
In the worst case, this shouldn't cause any more problems,
though it may not help either.  Time will tell.

Lib/test/test_select.py

@@ -1,5 +1,5 @@
 # Testing select module
-from test.test_support import verbose
+from test.test_support import verbose, reap_children
 import select
 import os
 
@@ -65,5 +65,6 @@ def test():
             continue
         print 'Unexpected return values from select():', rfd, wfd, xfd
     p.close()
+    reap_children()
 
 test()