break oss build dependency on fboss/common/
break oss build dependency on fboss/common/

Summary:
All of the requisite headers are now open sourced and eden
has been converted to use them. This removes any logic that references
this directory and kills the now unused cmake file.

Reviewed By: chadaustin

Differential Revision: D16994732

fbshipit-source-id: 573b8b50540ee64590682be2a54aa94659f12368

facebook/wangle,facebook/wangle,facebook/wangle