qa: add 1-ceph-install to upgrade:luminous-x

Signed-off-by: Yuri Weinstein <yweinste@redhat.com>
(cherry picked from commit aff342627cf77e2faae6904e626d9fb2c897f155)

diff --git a/qa/suites/upgrade/luminous-x/stress-split-erasure-code/1-ceph-install b/qa/suites/upgrade/luminous-x/stress-split-erasure-code/1-ceph-install
new file mode 120000 (symlink)
index 0000000..0479ac5
--- /dev/null
+++ b/qa/suites/upgrade/luminous-x/stress-split-erasure-code/1-ceph-install
@@ -0,0 +1 @@
+../stress-split/1-ceph-install/
\ No newline at end of file