sleep 0.1s before testing redis instance again

Originally we fail to sleep 0.1s before retrying.

Change-Id: I454ee9ef07ac8efe34217f2abeeb64a44db7733a
Signed-off-by: Henry-CF <hchen@rbcon.com>

redis/lib/redis_service/redis_node.rb

@@ -340,14 +340,14 @@ def start_instance(instance, db_file = nil)
           redis.echo("")
           return pid
         rescue => e
+          sleep 0.1
           next
         ensure
           begin
             redis.quit if redis
           rescue => e
           end
         end
-        sleep 0.1
       end
       @logger.error("Timeout to start redis server for instance #{instance.name}")
       # Stop the instance if it is running