delete the legacy fbcode_builder_configs
delete the legacy fbcode_builder_configs

Summary: fbcode_builder configs have been replaced by getdeps manifests.

Reviewed By: zertosh

Differential Revision: D36526391

fbshipit-source-id: 74a08710b0e3b2192379954c242251fd33ca1fb4

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift