This answer was provided by Gari Singh, on a comment above:
2 solutions: 1) Move to Fabric v1.1 which was just recently released 2) I was unable to get govendor to work properly in terms of pulling down the right version of Fabric. So you could do a "go get" for "github.com/hyperledger/fabric", then "cd $GOPATH/src/github.com/hyperleger/fabric", then "git checkout v1.0.3" and then go back to your chaincode project and do "govendor add ..." for whichever Fabric packages you need. – Gari Singh