#18584: s/testcleanup/testsetup/ until we switch to Sphinx 1.1.

testcleanup directive is new as of 1.1, and we are currently running
1.0.7.  But using testsetup works just as well, and avoids the
unknown directive error when building the docs.

Doc/library/email.iterators.rst

@@ -68,7 +68,7 @@ The following function has been added as a useful debugging tool.  It should
                   text/plain
           text/plain
 
-   .. testcleanup::
+   .. testsetup::
 
       >>> somefile.close()
 

Doc/library/email.policy.rst

@@ -85,7 +85,7 @@ file on disk and pass it to the system ``sendmail`` program on a Unix system:
    >>> p.stdin.close()
    >>> rc = p.wait()
 
-.. testcleanup::
+.. testsetup::
 
    >>> mymsg.close()
    >>> mocker.stop()