qa/suites/rados/upgrade: remove stray link

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/qa/suites/rados/upgrade/supported-random-distro$ b/qa/suites/rados/upgrade/supported-random-distro$
deleted file mode 120000 (symlink)
index 7cef21e..0000000
--- a/qa/suites/rados/upgrade/supported-random-distro$
+++ /dev/null
@@ -1 +0,0 @@
-../basic/supported-random-distro$
\ No newline at end of file