Skip broken test in mixed version cluster

Feature is new in 5.2.

Relates to #22342. Found by
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+5.2+multijob-darwin-compatibility/6/console

Author: nik9000

rest-api-spec/src/main/resources/rest-api-spec/test/cat.shards/10_basic.yaml

@@ -1,5 +1,8 @@
 ---
 "Help":
+  - skip:
+      version: " - 5.1.99"
+      reason:  refresh listeners is new in 5.2.0
   - do:
       cat.shards:
         help: true