Log failure to dump configs less frequently
Log failure to dump configs less frequently

Summary: It's not necessary to log every single failure to dump last valid configs.

Reviewed By: jmswen

Differential Revision: D4711040

fbshipit-source-id: 774f2659213dcdfe23ef927092397f2b1e71cc5e

facebook/mcrouter,facebook/mcrouter,facebook/mcrouter,facebook/mcrouter