Use folly::settings in memcache
Use folly::settings in memcache

Summary: Use folly::settings in memcache

Reviewed By: stuclar

Differential Revision: D14109669

fbshipit-source-id: fe1d845a46b66224e65fcb838bd512383e757ff7

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