qa/suites: Make fixed-4 an option for verify tests

Fixes: https://tracker.ceph.com/issues/67489
Signed-off-by: Brad Hubbard <bhubbard@redhat.com>

diff --git a/qa/suites/rados/verify/clusters/fixed-4.yaml b/qa/suites/rados/verify/clusters/fixed-4.yaml
new file mode 120000 (symlink)
index 0000000..aa88300
--- /dev/null
+++ b/qa/suites/rados/verify/clusters/fixed-4.yaml
@@ -0,0 +1 @@
+.qa/clusters/fixed-4.yaml
\ No newline at end of file