qa: Fixed link to centos distro

Signed-off-by: Yuri Weinstein <yweinste@redhat.com>

diff --git a/qa/suites/upgrade/hammer-jewel-x/parallel/distros/centos.yaml b/qa/suites/upgrade/hammer-jewel-x/parallel/distros/centos.yaml
index 4cfff2dfdca988df71d05c70ce339f574b3c5110..c79327bea594335155c721ae20e6463023f391d0 120000 (symlink)
--- a/qa/suites/upgrade/hammer-jewel-x/parallel/distros/centos.yaml
+++ b/qa/suites/upgrade/hammer-jewel-x/parallel/distros/centos.yaml
@@ -1 +1 @@
-../../../../../distros/all/centos_7.yaml
\ No newline at end of file
+../../../../../distros/all/centos_7.3.yaml
\ No newline at end of file