add -v/--verbose option to see more output
add -v/--verbose option to see more output

Summary: I found this useful to see where manifests resolve to when they are already built

Reviewed By: HarveyHunt

Differential Revision: D32644308

fbshipit-source-id: b796cb67f154177fbac1093290d97fe5aab6b20c

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly