Fix missing tcp-check in Redis HAProxy config

Change-Id: I22cbcffda55434b12ba9714cf3db86a104b9a89b
diff --git a/haproxy/proxy/listen/stacklight/redis.yml b/haproxy/proxy/listen/stacklight/redis.yml
index 881e8ed..7bc5ea6 100644
--- a/haproxy/proxy/listen/stacklight/redis.yml
+++ b/haproxy/proxy/listen/stacklight/redis.yml
@@ -5,6 +5,8 @@
         redis:
           mode: tcp
           check: False
+          options:
+          - tcp-check
           health-check:
             tcp:
               options: