bpo-33759: Fix test.test_xmlrpc.ServerProxyTestCase. (GH-7362) (GH-7371)

It depended on a global variable set by other tests.
(cherry picked from commit 7cfd8c6a1b53a7dbdea14b6f414f2629dcd130a2)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
1 file changed