ec-rados-default is not fit for dumpling parallel upgrade

Because it may race with the upgrade and end up being unable to perform.

http://tracker.ceph.com/issues/9608 Fixes: #9608

Signed-off-by: Loic Dachary <loic-201408@dachary.org>
(cherry picked from commit b77ef02bc5ca623d2c5577c2caafcf3720ddd2ec)

diff --git a/suites/upgrade/dumpling-firefly-giant/parallel/6-giant-workload/ec-rados-default.yaml b/suites/upgrade/dumpling-firefly-giant/parallel/6-giant-workload/ec-rados-default.yaml
deleted file mode 120000 (symlink)
index a8a0ae6..0000000
--- a/suites/upgrade/dumpling-firefly-giant/parallel/6-giant-workload/ec-rados-default.yaml
+++ /dev/null
@@ -1 +0,0 @@
-../../../../../erasure-code/ec-rados-default.yaml
\ No newline at end of file