Change ensureDirExistsAndWritable from 600 to 700
Change ensureDirExistsAndWritable from 600 to 700

Differential Revision: D30024122

fbshipit-source-id: c4da9adb239887eb677f797d83e8a93cfed20ee6

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