qa/rgw: rgw/multisite uses supported-random-distro$

Signed-off-by: Casey Bodley <cbodley@redhat.com>
(cherry picked from commit 1942095a320d222c6cac972a4f0dc768e999c313)

diff --git a/qa/suites/rgw/multisite/supported-random-distro$ b/qa/suites/rgw/multisite/supported-random-distro$
new file mode 120000 (symlink)
index 0000000..0862b44
--- /dev/null
+++ b/qa/suites/rgw/multisite/supported-random-distro$
@@ -0,0 +1 @@
+.qa/distros/supported-random-distro$
\ No newline at end of file