libcli/security: move Windows test script to windows subdir

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

diff --git a/libcli/security/tests/windows-sddl-test.py b/libcli/security/tests/windows/windows-sddl-tests.py
similarity index 100%
rename from libcli/security/tests/windows-sddl-test.py
rename to libcli/security/tests/windows/windows-sddl-tests.py