trivial: Move test file

Signed-off-by: Stephen Finucane <stephen@that.guru>

diff --git a/patchwork/tests/test_xmlrpc.py b/patchwork/tests/views/test_xmlrpc.py
similarity index 100%
rename from patchwork/tests/test_xmlrpc.py
rename to patchwork/tests/views/test_xmlrpc.py