Dockerfile fix to copy all the cfg files

Dockerfile

@@ -2,11 +2,8 @@ FROM golang:1.8
 WORKDIR /kube-bench
 RUN go get github.com/aquasecurity/kube-bench
 RUN cp /go/bin/kube-bench /kube-bench/ && chmod +x /kube-bench/kube-bench
-WORKDIR /kube-bench/cfg
-RUN wget https://raw.githubusercontent.com/aquasecurity/kube-bench/master/cfg/config.yaml && \
-    wget https://raw.githubusercontent.com/aquasecurity/kube-bench/master/cfg/federated.yaml && \
-    wget https://raw.githubusercontent.com/aquasecurity/kube-bench/master/cfg/master.yaml && \
-    wget https://raw.githubusercontent.com/aquasecurity/kube-bench/master/cfg/node.yaml
+RUN cp -r /go/src/github.com/aquasecurity/kube-bench/cfg cfg
+
 # When Docker Hub supports it, we would split this into a multi-stage build with the second part based on, say, alpine for size
 WORKDIR /
 ADD entrypoint.sh /entrypoint.sh