Remove the final gcfg-based code.
Remove the final gcfg-based code.

This commit removes the last code in CloudProxy that had anything to do with
code.google.com/p/gcfg, since all configuration now uses protobufs.

jethrogb/cloudproxy,kevinawalsh/cloudproxy,jethrogb/cloudproxy,William-J-Earl/cloudproxy,jethrogb/cloudproxy,tmroeder/cloudproxy,jethrogb/cloudproxy,tmroeder/cloudproxy,cjpatton/cloudproxy,jlmucb/cloudproxy,cjpatton/cloudproxy,cjpatton/cloudproxy,jlmucb/cloudproxy,jethrogb/cloudproxy,jlmucb/cloudproxy,cjpatton/cloudproxy,William-J-Earl/cloudproxy,jlmucb/cloudproxy,jlmucb/cloudproxy,William-J-Earl/cloudproxy,kevinawalsh/cloudproxy,cjpatton/cloudproxy,tmroeder/cloudproxy,tmroeder/cloudproxy,William-J-Earl/cloudproxy,William-J-Earl/cloudproxy,tmroeder/cloudproxy