Modified Dockerfile for the SDK sample

Prior to this change the Dockerfile installed hfc from
source.  With this change the published version of hfc
will be installed

Fixes FAB-541

Change-Id: Ic1461975abecdf9bdf387700a179510ec0add019
Signed-off-by: Gari Singh <gari.r.singh@gmail.com>

examples/sdk/node/Dockerfile

@@ -2,10 +2,6 @@ FROM hyperledger/fabric-peer:latest
 # setup the chaincode sample
 WORKDIR $GOPATH/src/github.com/hyperledger/fabric/examples/chaincode/go/chaincode_example02
 RUN go build
-# build the node SDK
-WORKDIR $GOPATH/src/github.com/hyperledger/fabric/sdk/node
-RUN make all
-# now switch to the sample node app location when the shell is opened in the docker
 WORKDIR $GOPATH/src/github.com/hyperledger/fabric/examples/sdk/node
 # install the hfc locally for use by the application
-RUN npm install $GOPATH/src/github.com/hyperledger/fabric/sdk/node
+RUN npm install hfc